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- 他们断定还是呆在原地好。
They figured it was better to stay where they were.
- 她断定那笔钱用得不是地方，而我们在经济上遇到的困难却也似乎说明她言之有理。
She claimed that money had been wasted and our financial difficulties seemed to prove her point.
- 我确实没法断定。
I really couldn't tell.
- 从他的外表，我们可以有把握地断定他烟抽得很凶。
From his appearance we may safely conclude that he is a chain smoker.
- 我断定他有40来岁。
I judge him to be about 40.
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