重点讲解：
1. at risk of 处境危险；有风险的；在危险中；
An estimated seven million people are at risk of starvation.
估计有700万人面临着饿死的危险Sw9!y%5nOmODy;。
2. on average 平均起来；按平均值；
New diseases are now emerging at the unprecedented rate, on average, of one per year.
新疾病现正以平均每年一种的空前速度出现4E8v&qJUKjvPYYR0。
3. all sorts of 各种各样的；形形色色的；
I was just a kid and full of all sorts of wild ideas.
我不过是个孩子，充满各种奇异的想法W7.|ukRTpS5IRk5rS,,_。
4. get off 走开；离开；
We'd better get off the lake before the storm breaks, or we'll get soaked.
我们最好在暴风雨来临之前离开湖面，不然我们会淋透的,n1IQpESD(m^2^c)。