检测项目包括有机磷 、 有机氯 、 菊酯、三氯杀螨醇 、 硝酸盐和重金属铅.The test items included organic phosphorus, organic chlorine, pyrethroids , dicofol, nitrate and heavy metal plumbum....
这位白发的农民默想着他过去所受的苦难.The hoary peasant mused over his past sufferings.白发的产生部分原因是褪黑素减少或完全停止产生褪黑素.Gray hair results when, for some reason, the production of melanin is reduced, or stops completely....
Aircraft production continued to plod along at an agonizingly slow pace.飞机制造业仍旧举步维艰，发展速度之缓很让人头疼。He was destined to plod the path of toil.他注定要在艰辛的道路上跋涉.They had to plod wearily on up the hill.他们不得不迈着疲倦的步子登上山....