Fill the cooling system with antifreeze as a protection against frost.是什么意思？

Fill the cooling system with antifreeze as a protection against frost.

在冷却系统里加防冻剂以防止霜冻.

fill

vt.& vi. （使）充满，（使）装满；vt. 满足，配药，（按订单）供应，使充满（感情）；n. 填满…的量，充分，装填物，路堤；

例句
Before leaving, he went into his office to fill in the daily time sheet.
离开前，他到自己的办公室填写了日常考勤表。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

cooling

n. 冷却；adj. 凉的，凉爽的，冷却的；v. （使）变凉( cool的现在分词 )，（使）冷静；

例句
Cohen didn't mention that he had Ted Forstmann cooling his heels in a back room.
科恩没有提起自己让泰德·福斯特曼在后室里空等的事。

system

n. 体系，系统，制度，身体，方法；

例句
The whole system should be abolished.
整个制度应该被废除。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

antifreeze

n. 防冻剂；

例句
Fill the cooling system with antifreeze as a protection against frost.
在冷却系统里加防冻剂以防止霜冻.

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

protection

n. 保护，护照，[经]保护贸易制，保护政策，（向歹徒缴纳的）保护费；

例句
For added protection choose a lipstick with a sun screen.
选择防晒护唇膏来增强保护。

against

prep. 反对，对…不利，紧靠，以防；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

frost

vt.& vi. 使结冰霜，冻坏，（在蛋糕上）撒糖霜；vi. 结霜，受冻；n. 霜冻，结霜，严寒，寒冷，冷淡；

例句
There is frost on the ground and snow is forecast...
地上结霜了，而且预报说会有雪。