safest

adj. 安全的
adv. 安全地

例句与用法：

The safest way to double your money is to fold it over once and put it in your pocket.

把钱加倍的最安全之法，是把它折叠一次，然后放进口袋里。

It's safest to remain a good distance behind in case the car in front suddenly stops.

远远地跟在后面是最安全的，以防前面的汽车突然停下来。

It's safest to keep well behind the car in front in case it suddenly stops.

与前面的汽车保持较大距离是最安全的，这样可以防备它突然刹车。