英语习语：

bite off more than one can chew 贪多嚼不烂；心有余而力不足；不自量力；力不从心

——I hear you've been taking an advanced physics course this semester. How's it going? (我听说这学期你在上高等物理课。这门课怎么样？)
——I think I've bitten off more than I can chew. (我是心有余而力不足啊。)

双语例句：
We bite off more than one can chew when we started this project.
我们在一开始这工程时就没有量力而行了。

Don't bite off more than one can chew.
不要贪多嚼不烂。不要自不量力。

Don't bite off more than one can chew.
不要贪多嚼不烂。不要自不量力。