Fertilization is external, producing free-living planula larva.

体外，能产生自由活动的浮浪幼虫。

In human reproduction,one female egg is usually fertilized by one sperm.

在人体生殖过程中,一个子使一个卵子。

Syngamy - The fusion of egg and sperm cells into a zygote.

Syngamy -融合卵子细胞卵。

Only one sperm fertilises an egg.

只有一个子使卵子。

Bees fertilize flowers.

蜜蜂使花。

The male and female pronucleus fused finally.Most hybrids could develop normally.

熟的雌雄原核形后完融合过程，形合子核，过程结束。

Allogamy Cross-fertilization in plants.

植物中的异体。

This oosperm is you.

颗卵就是你。

DIESTRUS in the unspayed female dog. The period of sexual inactivity after the female is receptive.

未绝育雌狗的间情期.雌狗易后的性不活跃期.

Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.

该现象一般出现在具有闭花花的一些特定的植物中。

Sporopore The aerial spore-producing body of certain fungi, e.g. the mushroom of Agaricus.

为地钱的孢子体世代具有。由卵发育而来，包括基足、柄孢蒴。孢子体是寄生在配子体上的。

Autogamy:Self-fertilization in plants.

植物的自身。

Identical twins are also called monozygote twins because they develop from the splitting of a single fertilized egg.

因为是从同一个卵分裂而来，同卵双胞胎也被称作单卵双胞胎。

A paraffin method and a whole ovary stain clearing techique were used to study pseudogamy in Kentucky Bluegrass (Poa pratenesis L.).

本文运用石蜡切片法、整体透明法研究了草地早熟禾的假现象。

Abstract： Aim:To establish the methods of microfertilization and explore the fertilizing potential of mouse sperm obtained from caput epididymidis and cauda epididymidis.

摘 要： 目的:建立显微的方法，并探讨小鼠附睾子在显微注射进入卵母细胞后的能力。

Traditionally, doctors use gestational age, the number of weeks from fertilization to birth, to determine whether a preemie should receive invasive care.

传统上，医生们用孕龄，到出生的周数来决定极早产儿是否接进一步的关注。

Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假定能发生随机交配自花而不会为严重问题为依据的。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体的，生殖系统适于体内。单起源的吸虫（单殖纲）大多是鱼的外寄生虫。

Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨卵细胞第一极体形态与原核期卵形态、卵裂期胚胎质量的关系。