1.up to 多达

例句：I can take up to four people in my car.
我的汽车最多能坐四个人q9J5iMNlI2B7v5k。

2.at least 至少

例句：He's been away for at least a week.
他走了总有一个星期吧.PE6ptw#yb]7g。

3.gets sick 生病

例句：To eat putrid food is liable to get sick.
吃了腐败的食物容易生病OHreLK~f^ogm。

4.leading cause 主因

例句：Homicide is the leading cause of death among black men
谋杀是黑人死亡的主要原因LrP+rkxxJ!#sg=。