keep up with
跟上, 不落后; 与...并肩前进
与...保持接触
How many of your old school fdriends do you keep up with?
by any chance
万一, 碰巧, 或许
by chance
偶然, 意外地
let alone
Not to mention; much less:
更不用提；更别说：
“Their ancestors had been dirt poor and never saw royalty, let alone hung around with them”(Garrison Keillor)
“他们的祖先穷得要命，从来没有见过王族成员，更不用说和他们在一起了”(加里森·谢勒)
let go
To cease to employ; dismiss:
不再雇用；解雇：
had to let 20 workers go.
必须解雇二十名工人
