sump

n 1 casing under an engine holding the lubricating oil （发动机下面的）润滑油箱. 2 cavity or hollow area into which waste liquid drains 污水坑; 聚水坑.

sum total, sum up, sum...up, summarily, summarise, summarize, summarize, summarise, summary, summation, summer, summer pudding, summer school, summer time (Brit) (US `fast time), summer-house, summer-time, summery, summit, summon, summon up, summons, sumptuous, sumptuously, sumptuousness, sun, sun-baked, sun-blind, sun-drenched, sun-glasses, sun-god, sun-hat, sun-lamp, sun-ray, sun-roof, sun-tan, sun-tanned, sun-trap, sun-up, sun-worship, sun-worshipper, sunbathe,