work hard后面加什么介词
例如There are many who will work hard to achieve these goals
I\'ll work hard. I don\'t want to let him down
我会努力工作，我不想让他失望。
Everyone would have to work hard together to rebuild the economy
所有人都应该一起努力以重建经济。
How do you motivate people to work hard and efficiently?
你是怎样激励大家奋发高效地工作的？