work on 有什么区别呢？
work in 基本释义1。插进
2。引进
3。掺和 1。插进
He worked in the key and opened the door of the office。
他插进钥匙把办公室的门打开了。
The wire was slowly worked in。
铁丝慢慢地穿了进去。
2。引进
While telling the story he worked in a few jokes to make his listeners laugh。
在讲那个故事的时候, 他穿插了几个笑话引听众们发笑。
3。掺和
The worker worked in a little copper with the alloy。
工人在合金里搀了一点铜。
work at 基本释义1。在…工作
2。从事于…, 致力于… 1。在…工作
How long have you been working at the bank?
你在银行里工作多久了?
2。
从事于…, 致力于…
Is Tom still working at the new book that he promised?
汤姆仍在埋头撰写他曾允诺的那本新书吗?
work on
1。 继续工作，不断工作：
The director worked on in the office until ten o'clock last night。
主任昨晚在办公室工作到十点。