chemical ice添加化学保藏剂的冰chemicaladj.化学的n.药品；化学物chemical phenomenon化学现象chemical deaeration化学脱氧chemical dependency化学物质瘾; 毒瘾chemical plating Ni化学镀镍chemical pollutants化学性污染物chemical extraction化学提取chemical defleecing化学脱毛chemical synthesize化学合成chemical admixtures外加剂Chemical coloration化学着色

1. A chemical sprayed or dusted on plants to cause the leaves to fall off.
   落叶剂一种化学药剂，喷洒在植物上可使叶脱落
2. But even the mosquito has been subdued by attention to drainage and by chemical sprays.
   但甚至蚊子也由于我们注意排水和化学喷雾而已被抑制住了。