Water should be regularly chlorinated in public swimming baths to keep it pure.

公共游泳池水应定氯气消毒,以保持干净。

In fact the level of compression created within a regular pulsejet engine is very low, even by automobile standards.

事实上范围内定pulsejet引擎创建压缩程度很低甚至汽车标准。

Britain's best periodical art magazine.

英国最好定出版艺术杂志。

Trees of the family Dipterocarpaceae dominate the canopy and emergent layers of the hyper-diverse, aseasonal, humid lowland tropical forests of Southeast Asia.

以龙脑香科植物为主东南亚热带雨林有一非常特别现象，那就是不定大开花现象。

A life insurance company contract that pays periodic income benefits for a specific period of time or over the course of the annuitant's lifetime.

在特定间定定支付款项。是指在约定时间内，按年度支付相款项。例如，保险公司每年年、退休。