这两个手机的质量差很多。
zhè liǎng gè shǒujī de zhìliàng chàhěnduō 。
The quality of these two phones differs a lot.
我的中文跟他比差很多。
wǒ de zhōngwén gēn tā bǐ chàhěnduō 。
My Chinese is far behind his.
这次的成绩比上次差很多。
zhè cì de chéngjì bǐ shàngcì chàhěnduō 。
This time's results were much worse than last time's.