短语讲解：

1. Students claimed to have smoked at least 20 times in the prior 30 days.

at least 至少
例句：For that day at least he lost heart.
至少这一天他是垂头丧气的。

2. More students are experimenting with the drug for the first time, as well.

as well 也，还有
例句：Other technologies work as well or better.
其他技术同样可以，或者更好。

3. He pointed to studies of high school graduates between the ages of 19 and 22.

point to 指; 显示…的位置
例句：At midday both hands point to twelve.
正午两个指针都指向十二点。

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