您要查找的是不是：
- The children are learning to do their sums on an abacus. 孩子们正在学做珠算。
- They have done their work very ably. 他们胜任出色地做完了工作。
- done their sumsv. 判断清楚(思路清晰;根据事实推断;推理)
- My parents do their best to keep up the family tradition. 我的父母为了保持家庭的传统竭尽全力。
- do their sumsvt. 判断清楚(思路清晰;推理)
- They have done their utmost to learn the techniques of production. 他们尽了最大努力去学习生产技术。
- Some of the students had done their homework but most hadn't. 有些学生做了作业，但大多数都没做。
- We'll carry on as arranged and they can do their worst. 我们还按我们的计划办事,他们想怎么使坏就随他们便吧。
- Some people are not doing their whack. 有的人没有尽力。
- Our comrades must do their utmost to learn the techniques of production. 我们的同志们必须用极大的努力去学习生产技术。
- The teacher had to keep after her pupils to do their homework neatly. 教师一再嘱咐她的学生要把作业写整齐。
- They will do their best to help on this project. 他们将尽力推动这项研究工作。
- Those two girls do their hair in the same way. 那两个女孩把头发梳成相同的式样。
- So it may yet prove a masterstroke, if BofA's number-crunchers have got their sums right. 因此，如果美国银行那帮捣鼓数字的家伙算术算对了的话，这笔交易的确可能是绝妙之作。
- Everyone should be free to do their own thing. 任何人都应该有按自己的方式行事的自由。
- Must I keep servants and myself do their work? 难道我有佣人还得自己操劳吗?
- So it may yet prove a masterstroke, if BofA's number-crunchers have got their sums right. But that is a lot to ask in the middle of a storm. 因此，如果美国银行那帮捣鼓数字的家伙算术算对了的话，这笔交易的确可能是绝妙之作。不过，风雨未央，未知数还很多。
- Every one of them has done their best. 他们每人都尽力而为了。
- Through comparing their sums of squared error,it was concluded that prediction error algorithm-based OE model has the best precision. 通过误差平方和的比较,确定利用基于输出误差(OE)模型的预报误差法所建立的模型的精度最高。
- Doctors do their best to treat the sick, but they can't perform miracles. 医生尽力治疗病人，但他们无法创造奇迹。
