1. There are good reasons why crop plants do not use dryness defenses already. 已有充分的理由可以说明农作物为什么不使用干旱防御。
2. They have different defenses that help them survive in the wild. 它们有不同的防御措施来帮助它们在野外生存。
3. This was the first suggestion of algal defenses against grazing. 这是藻类抵御放牧的第一次迹象。
4. Angry owners have called on the Government to erect sea defenses to protect their homes. 愤怒的业主呼吁政府建立海防来保护他们的家园。
5. Perhaps we should give special attention to the conservation of such plant species since they lack key factors in their defenses against the environmental disruption caused by pesticide use. 也许我们应该特别注意保护这类植物,因为它们缺乏关键的因素来抵御由使用杀虫剂而造成的环境破坏。