I had a bummer of a day...我一天都很烦。I had a bummer of a day.我一天都很烦。Elvin : Right. And that would be a total 4 giga - bummer.艾文: 没错. 到时就一败涂地了.It's a real bummer that she can't come.她不能来，实在令人失望。What a bummer!真烦人！Now...
The pistons are graphite-coated to reduce friction.活塞上涂了一层石墨以减小摩擦力。Some pistons have seating rings of metal or leather.有些活塞上有金属或皮革的密封环.A pump uses valves and pistons.泵使用阀和活塞....
Somewhere close at hand a train rattled by.一辆火车从我的身边轰隆隆地开过。The steam pipes rattled suddenly, and Franklin uttered a shriek and jumped with fright...蒸汽管突然发出咯咯的响声，富兰克林尖叫一声，吓得跳了起来。The bus from Odense rattled into a dusty vi...