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1.irrigation n. 灌溉；[临床] 冲洗；冲洗法
Irrigation is needed to make crops grow in dry regions.
干旱地区需要灌溉才能使作物生长。
2.habitat n. [生态] 栖息地，产地
Many species are in peril of extinction because of our destruction of their natural habitat.
许多物种由于我们破坏了它们的自然环境， 现在正面临灭绝的危险。
3.vector n. 矢量；带菌者；航线
Neither vector nor reservoir has been discovered and proved.
媒介和贮主至今都没曾得到发现和证实。
4.reproduce vt. 复制；再生；生殖；使…在脑海中重现 vi. 复制；繁殖
Most plants reproduce through seeds.
多数植物都是靠种子来繁殖。
