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1·Crossing-over this cycle is not so easy.

跨越这个循环不是那么容易。

2·Advertisement crossing-over, one kind this is link means is out of shape.

广告互换，这是链接方式的一种变形。

3·Want to compare the cost of their crossing-over and income from social Angle.

要从社会的角度比较它们互换的成本和收益。

4·PAE is stable over generations and has been suggested to be caused by unequal crossing-over.

PAE突变能在世代间稳定传递，其产生机制可能为等位基因间的不等交换。

5·He made the crossing from Cape Town to Sydney in just over twenty-six days.

他从开普敦横渡到悉尼只用了二十六天多时间。《柯林斯英汉双解大词典》

6·Don't worry about crossing over the tracks.

不用为穿过铁道而担心。

7·Moose reached Isle Royale in Lake Superior by crossing over winter ice and multiplied freely there in isolation without predators.

麋鹿穿过冬天的冰雪，到达苏必利尔湖的皇家岛，在那里，它们没有天敌，自由繁殖。

8·It is believed to have originated in South America in the early 1900s, and later spread to Europe before crossing over to sub-Saharan Africa.

它被认为是在20世纪初起源于南美洲，后来传播到欧洲，然后跨越到撒哈拉以南的非洲。

9·Valley Crossing will take you through some stunning scenery but there are several points along the way where you'll need the level of fitness required to get over some pretty big rocks.

山谷穿越路线会带你们欣赏沿途一些令人惊叹的美景，但经过某些地方时，大家需要具备良好的身体素质，才能翻越巨大的石头。

10·Their first problem was crossing over a huge mountain.

他们第一个问题是翻越一座高山。