原文视听

Now it's her partner's turn.
现在轮到它的伴侣出去觅食
A chick's demands are endless.
雏鸟是需索无度的
Sometimes they can push parents to desperate lengths.
有时可能逼得父母铤而走险
But birds are masters of improvisation.
但鸟类是随机应变的大师
Dassen Island, off the coast of South Africa,
南非外海的达森岛
is home to a nesting colony of great white pelicans.
白鹈鹕集体在这儿筑巢
There are chicks of all ages all with a hefty appetite.
这里的雏鸟年纪虽然不一样 但全都食欲旺盛
The parents have a formidable task.
父母肩负一项艰巨任务
These pelicans are among the heaviest flying birds in the world,
这些鹈鹕是世上最笨重的飞鸟
weighing up to 10 kilos.
最多重达十公斤
A V-formation is the most energy efficient means of flying.
V字队形是最省力的飞行方式
It significantly reduces drag for the bird behind.
为后面的鸟儿大幅降低阻力
Pelicans normally fish along the coast,
鹈鹕通常在岸边捕鱼
but a shortage of food supplies has forced them to look elsewhere.
但食物供应短缺 它们只得到别处觅食

重点解释

Sometimes they can push parents to desperate lengths.有时可能逼得父母铤而走险

push to推向

My aspirations push me to work harder every day.

我的抱负让我每天要努力工作。

Don't push me to use the last stance.

别逼我用绝招。

These pelicans are among the heaviest flying birds in the world,weighing up to 10 kilos.这些鹈鹕是世上最笨重的飞鸟最多重达十公斤

weigh up估量

You should weigh up the situation.

你应该估量一下形势。

A pineapple can weigh up to 10 kilograms.

波罗蜜果实的重量可大于10公斤。

but a shortage of food supplies has forced them to look elsewhere.但食物供应短缺，它们只得到别处觅食

be forced to被迫(不得不)

The truck was forced to lie by for repairs.

卡车不得不停下来修理。

The enemy was forced to retreat.

敌人被迫撤退。