吃透英语课本，提升在校竞争力
v. 打扫；使干净；“clean”的过去式和过去分词
Mary cooked and cleaned for them.
玛丽为他们做饭、打扫卫生。
She cleaned the room.
她打扫了房间。
cleaned coal
精煤
adj.净化的
purified
smectic
