pre-,在前，早于，mature,成熟的。

1. Accidents are still the number one cause of premature death for Americans.

交通事故仍然是造成美国人过早死亡的头号因素。

2. Premature birth is the main cause of perinatal mortality.

早产是临产死亡的主要原因。

3. It is premature to speculate about the resumption of negotiations.

现在猜测谈判是否会重新开始还为时过早。

4. I think it's premature for restaurants to come out with that advice.

我认为餐馆提出那样的建议太草率了。

5. Even very young premature babies respond to their mother's presence.

即使是很小的早产儿也会对母亲的出现做出反应。