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1 . be bad at 不善于。如：
I’m bad at maths. 我数学学得很差。
He is bad at playing tennis. 他网球打得不好。
2 . be bad for 对……不好。如：
Too much salt can be bad for you. 吃太多的盐对你不好。
Smoking is bad for you . 抽烟对你有害。
3 . go from bad to worse 变得越来越糟，每况愈下。如：
His business is going from bad to worse. 他的生意每况愈下。
We’re hoping for an improvement but things have gone from bad to worse. 我们希望有所改善，但情况却变得越来越糟。
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