繁重的英文：
numerous and heavy

参考例句：

The tasks are arduous.
任务繁重。

He had to be of very strong constitution to put up with such tiring mental labour.
他一定有很强健的身体才能担负起那么繁重的脑力劳动。

It was an onerous task and he had to be careful to make sure the top-heavy craft cast off in a smooth sea
这是一项繁重的任务，他必须小心谨慎，确保上部过重的礼仪船在风平浪静的海面上开船。

She desired a fixed occupation-no matter how onerous, how irksome
她希望有个固定的职业，不管这个职业多么繁重，多么令人厌倦。

Strenuous labour wore out their youth.
繁重的劳动使她们失去了青春。

Have/take a rest from all your hard work
放下繁重的工作休息一下

strenuous labour wore out their youth
繁重的劳动使她们失去了青春。

Unremitting care,boredom,drudgery
无休止的操心、厌倦感、繁重工作.

The heavy workload forced me to cancel the camping trip.
繁重的工作量迫使我取消去露营。

The hardest work was assigned to the strongest laborers.
最繁重的工作分配给最强壮的劳工。

numerous是什么意思：
adj. 众多的；许多的；数不清的

The numerical symbol0; a cipher.
0数字符号0；零

For conservationists, the material has numerous benefits.
在环保人士眼里，这种新材料具有很多优点。

The beehives consist of numerous cells.
蜂巢是由无数的小窝所组成的。

Our own numeral system is an example of a positional numeral system with base 10
我们现在所用的数系就是以10为基的定位数系。

Map this number to the Roman numeral system.
将这个数字映射到罗马数字系统。

heavy是什么意思：
adj. 沉的；超出一般的；辛苦的；厚的；繁忙的；耗费...的；危险的；沉闷的；严厉的
n. 保镖；苦啤酒

a truck; a heavy duty truck
载重汽车

Light Burdens far heavy
远途无轻担

An elephant has a heavy build.
大象躯体庞大。

They were burdened with heavy taxation.
他们负担重税。

A light purse is a heavy curse
为人无钱处处难