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dropping pit
anim.husb. 鸡舍粪沟
tech. 粪坑
drop pit
construct. 凹坑
ecol. 跌坑
eng.geol. 跌水坑
tech. 整修机车底部的地坑; 修车坑; 跌水井; 渠道集水井; 落轮坑; 凹井; 集水坑
drop-pit
tech. 凹坑