be up to

• The children are up to some mischief , i will be bound !
  孩子们在搞恶作剧，我敢肯定！
• The children are up to mischief .
  小孩子们想胡闹。
• An indian or a chinese meal ? it is up to you .
  吃印度饭菜还是吃中国饭菜？由你决定吧。
• We are up to the elbows in work .
  我们正埋头工作。
• Whether you go or not is up to you .
  去不去随你。
• The product is up to standard .
  产品合格。
• Who could tell what devilry the ingenious americans were up to ?
  谁说得准那些诡计多端的美国人在搞什么鬼名堂？
• This may be up to 50km thick and comprises ultrabasic peridotite .
  其厚度可达50公里并由超基性的橄榄岩所组成。
• Half my money 's gone -- you have been up to your tricks again , have not you ?
  我的钱少了一半又是你干的，对不对？
• Just lately i've been up to my ears. you've no idea how much work there is .
  最近我忙得不得了，你不晓得我有多少工作要做。