Only after pollination can the next process occur-fertilisation-when the pollen carried from another plant fertilises a female ovule to make new seeds.

只有经过了授粉，下一个程序——被带到另一个植物上的花粉在磁性胚珠上授来结成新种子——才会发。

Only after pollination can the next process occur – fertilisation - when the pollen carried from another plant fertilises a female ovule to make new seeds.

只有在授粉之后，下一个过程才会发————从另一株植物上带过来的花粉使一个性胚珠，从而产新的种子。

In the latest study, the team used micro-CT technology to scan the fossil and found that the interior contained inverted ovules, which is a key feature for determining angiosperms.

在最新的研究中，该团队使用微型 CT 技术扫描化石，发现内部包含倒置的胚珠，这是确定被子植物的关键特征。

Sponges can reproduce both sexually and asexually – and when they take the asexual route, usually in harsh conditions, they produce a tiny bundle of embryonic cells called a gemmule.

海绵可以进行有性繁殖和无性繁殖——当它们采取无性繁殖方式时，通常是在恶劣的条件下， 它们会产一小束称为胚珠的胚胎细胞。

There must sometimes be a physical impossibility in the male element reaching the ovule, as would be the case with a plant having a pistil too long for the pollen-tubes to reach the ovarium.

有时雄性成分到达胚珠在物理上是不可能的， 例如蕊太长以至于花粉管无法到达子房的植物就是这种情况。

In certain whole groups of plants the ovules stand erect, and in others they are suspended; and within the same ovarium of some few plants, one ovule holds the former and a second ovule the latter position.

在某些整群植物中， 胚珠直立，而在另一些植物群中， 胚珠则悬空；在少数植物的同一个子房内， 一个胚珠占据前者的位置， 第二个胚珠占据后者的位置。

If so, the position of the ovules, even when one is erect and the other suspended within the same ovarium, would follow the selection of any slight deviations in position which favoured their fertilisation, and the production of seed.

如果是这样， 胚珠的位置， 即使一个直立而另一个悬置在同一个子房内，也将遵循有利于它们和种子产的任何轻微位置偏差的选择。