On the customs declaration, the sender labeled the freight as agricultural machinery.在报关单上，寄货人将货物列为农用机械。If undelivered, please return to sender.若无法投递，请退还寄信人。Undeliverable, returned to sender.无法投递, 退回原处....
狄氏剂与艾氏剂有关,对蚯蚓的毒性是相似的.Dieldrin is related to aldrin, and its toxicity to earthworms is similar.艾氏剂和氯丹都是重要的杀虫剂.Both Aldrin and Chlordane are valuable insecticides....
而且所有声频均有指向性,声频愈高, 指向性愈强.The higher the acoustic frequency is, the stronger its directivity is.它表现在空间生产力发展的继承性 、 指向性 、 加速性和国际性四个方面.The inheritance that its performance grows in dimensional productivity, directivity, accel...