Polar bears have an extraordinarily sensitive sense of smell.北极熊的嗅觉异常灵敏

sense of smell:嗅觉

Some animals have an acute sense of smell.

有些动物的嗅觉很敏锐。

Dogs have a highly developed sense of smell.

狗有著高度发达的嗅觉。

A whale carcass could provide more than any one family could eat.一具鲸尸喂饱一个北极熊家庭绰绰有余

more than:超过；多于；不仅仅

This city has a population of more than 1,000,000.

这个城市人口超过一百万。

I'll stay here not more than three days.

我将待在这里最多不超过三天。

She's taking a risk bringing her cubs here.母北极熊把小熊带来这里冒了很大的险

take a risk:冒险

He took a risk when he crossed the old bridge.

他冒险过这座旧桥。

He was taking a risk by overtaking on a bend.

他在转弯处超车是在冒险。