Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只。

Fleas are parasites.

是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要或动物媒介，而是由人传人空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由壁，，子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得蚤。

Fleas are parasites.

蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经蚤或动物媒介，而是由人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由壁虱，蚤，虱子等寄生虫传播）引起的疾病被人们疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是由人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是人人经空气吸染沬。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

几种不同的发疹伤寒病原体（可壁虱，跳蚤，虱子等寄生虫）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺疫是不需要经跳蚤或动物媒介，而是由人人经空气吸入受感染沬。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由壁虱，跳蚤，虱子等寄生）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

几种不同的发疹伤寒病原体（可壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳。

Fleas are parasites.

跳生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫不需要经跳或动物媒介，而由人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒原体（可由壁虱，跳，虱子等生虫传播）引起的人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动，而是由人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病（由壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只。

Fleas are parasites.

是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经动物媒介，而是由人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由，，子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。