Polar bears have an extraordinarily sensitive sense of smell.北極熊的嗅覺異常靈敏

sense of smell:嗅覺

Some animals have an acute sense of smell.

有些動物的嗅覺很敏銳。

Dogs have a highly developed sense of smell.

狗有著高度發達的嗅覺。

A whale carcass could provide more than any one family could eat.一具鯨尸喂飽一個北極熊家庭綽綽有余

more than:超過；多于；不僅僅

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

這個城市人口超過一百萬。

I'll stay here not more than three days.

我將待在這里最多不超過三天。

She's taking a risk bringing her cubs here.母北極熊把小熊帶來這里冒了很大的險

take a risk:冒險

He took a risk when he crossed the old bridge.

他冒險過這座舊橋。

He was taking a risk by overtaking on a bend.

他在轉彎處超車是在冒險。