1·As trees became scarce and they could no longer construct wooden canoes for fishing, they ate birds.
由于树木变得稀少，他们不能再建造木制的独木舟来捕鱼，只好捕食鸟类。
2·It may be that males can use scarce carotenoids either for immune defense and detoxification or for attracting females.
可能是雄性可以利用稀少的类胡萝卜素进行免疫防御和解毒，或者吸引雌性。
3·Compared with Metarhizium anisopliae and Beauveria bassiana, the study on Verticillium lecanii is scarce.
相对于金龟子绿僵菌和球孢白僵菌而言，对于蜡蚧轮枝菌的研究十分稀少。
4·But the operation has also been criticised for focusing scarce resources on thinly populated areas.
但是这次行动也被指责为是在人口稀少的地区争夺稀少的资源。
5·Even if the rise in output comes about but in the "wrong" way, there could be problems, since water in some areas is growing scarce and increasing food output will make it scarcer.
如果采用不恰当的方式，那么即使粮食产量增长，也会问题多多，因为某些地区的水源已经越来越稀少，而提高粮食产量会使其更稀少。