157　good at和weak in等的比较

　英语中的介词同其他词往往有固定搭配。

比较

good at长于

better at更强

difference between ……的差别

different in在某方面不同

different from与……不同

差，弱 ：

weak in

poor in

go along沿……走

go across横穿

go through穿过

She is better than Mary at singing. 她歌唱得比玛丽好。

He is poor in health. 他身体弱。

She is weak in maths. 她数学差。

What's the difference between the two pictures? 这两幅画有什么差别？

These flowers are different in colours. 这些花颜色不同。