These backpacks are designed to carry a heavy load.

这些背包是为携带重物设计的。

《牛津词典》

It is cruel of him to make the donkey carry such a heavy load.

他真心狠， 让驴驮这么重的东西。

《新英汉大辞典》

Her grief is a heavy load to bear.

她心情沉重得难以忍受。

youdao

An electric motor helps the operator pull a heavy load or go up a hill.

VOA: special.2009.05.11

It was wading into a recession carrying a heavy load of expensive products on its back.

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Look, when the President and I got elected we knew we had a heavy load to carry.

WHITEHOUSE: Standing Behind the American Auto Industry

Each judge is assigned 30 games a heavy load and at the end of the weekend will rank his top seven.

WSJ: The Games Smart People Play | Mind Games | By Alexandra Peers