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- There seems to be no limit to the variety of defensive chemicals produced by insects. 昆虫生产的防御性化学物质，其种类之多不可胜数。
- Scientists do not yet know precisely how insects can produce their toxic defensive chemicals without poisoning themselves. 目前，科学家们尚未十分了解昆虫是怎样做到生产有毒的自卫化学物质而不伤及自身。
- After being attacked, host plants produced some secondary compounds to defend pest insects.The antifeedant is one part of these defensive chemicals. 植物在与昆虫协调进化过程中形成了许多具有防御功能的次生代谢物质。
- The forest will act as a defense against desert dust. 森林能起防御沙漠灰沙的作用。
- Many heroic men and women have died in defense of liberty. 许多英勇的男男女女为捍卫自由而牺牲。
- They had a dogged defense of the city. 他们对城市进行了顽强的防守。
- They are repairing the defense works. 他们正在修防御工程。
- The accused has the right to defense. 被告人有权获得辩护。
- It won't hurt you, but chemicals will. 它不会伤害你，但是农药会。
- The plant has recalled lids which leached out dangerous chemicals. 那家工厂回收了浸滤危险化学物质的盖子。
- ARPANET started by the US Dept. of Defense for research. 美国国防部建立了阿帕网，作研究用。
- She's on attachment to the Ministry of Defense. 她现在隶属于国防部。
- Noxious chemicals are found in the river water. 河水里发现了有毒化学物品。
- Chemicals that produce a noxious vapor when mixed. 化学物质混合后会放出有毒气体
- The defense was overwhelmed by superior numbers. 防守被优势的兵力摧垮了。
- She spoke up in defense of her political beliefs. 她为她的政见力辩。
- He was called as a defense witness. 他被传唤作被告的证人。
- Several nations formed a defense league. 几个国家结成了防御联盟。
- A place where drugs and chemicals are manufactured. 药厂用于生产药品和化学物质的地方
- He was the then secretary of Defense. 他是当时的国防部长。
