1、 It only takes one sperm to fertilize an egg.
只需一个精子就可以使卵受精。
来源:秒词邦搜集整理
2、 Since only one female usually lays eggs in a given larva, it would pay her to produce one male only, because this one male could fertilize all his sisters on emergence.
因为通常只有一只雌性在一个特定的幼虫中产卵，所以它只会产生一只雄性，因为这只雄性可以在孵化时使它所有的姐妹受精。
来源:秒词邦搜集整理
1、 Facing water shortages and escalating fertilizer costs, farmers in developing countries are using raw sewage to irrigate and fertilize nearly 49 million acres of cropland, according to a new report—and it may not be a bad thing.
根据一份新的报告，面对水资源短缺和不断上涨的化肥成本，发展中国家的农民正在使用未经处理的污水来灌溉和施肥近4900万英亩的农田，这可能不是一件坏事。
来源:2016年6月六级第3套阅读选择题
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