The industry today is nothing to what it once was.
这一行业的现状与昔日的盛况相比微不足道。
She's planning to return to work once the children start school.
她正计划孩子一入学就恢复上班。
I'll run back over the procedure once again.
我将重新考虑这个程序。
It's a lot of information to absorb all at once.
要一下子消化这么多资料，真是很难。
If necessary I can come at once.
如果有必要，我可以马上来。