make sure +从句 = make sure of 弄清、查清楚。
例句：
Make sure you get a good look at their faces.
你一定要仔细看清他们的.面孔。
Make sure that sign's the right way up.
一定不要把这招牌挂颠倒了。
Make sure you park your car clear of the entrance.
切莫把车停在入口处。
We make sure our clients get the best that money can buy.
我们确保客户买到最好的产品。