Keep quiet about it if you know what's good for you.
什么也别说,免得你自个儿添不自在。
I'm afraid I spilled coffee on the tablecloth.
对不起,我把咖啡洒到桌布上了。
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.