just的语法用例：
just like as：正好；恰好
例：This gadget is just the thing for getting those nails out.
译：这小玩意儿用来起那些钉子正合适。
just as：正当…时
例：The clock struck six just as I arrived.
译：我到达时，时钟正敲六点。
just about to do sth：正要；正准备；马上就要
例：The water's just about to boil.
译：水马上就要开了。
just about：几乎；近乎；差不多
例：I've met just about everyone.
译：我几乎每个人都见到了。
just now：此时；此刻；眼下
例：Come and see me later─I'm busy just now.
译：过些时候再来吧——我这会儿正忙着呢。