The crystals were cleaned by argon ion bombardment.是什么意思？

The crystals were cleaned by argon ion bombardment.

结晶体由氩离子轰击而净化.

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。

crystals

n. 水晶( crystal的名词复数 )，结晶（体）；

例句
These crystals are then embedded in a plastic, and the plastic is extruded as a wire...
然后将这些晶体嵌入一块塑料，再把塑料挤压成线。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

cleaned

v. （使）清洁( clean的过去式和过去分词 )，变干净，除去…的灰尘，使…干净；

例句
One day a week her mother systematically cleaned and aired each room.
她母亲按部就班地每周一次清扫所有的房间并开窗通风。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

argon

n. 氩；

例句
The crystals were cleaned by argon ion bombardment.
结晶体由氩离子轰击而净化.

ion

n. <物>离子；

例句
The possibility of its potential application is discussed for separation of actinon - lanthanon mixtures by ion exchange.
讨论了该离子交换法在分离锕 - 镧系元素上应用的可能性.

bombardment

n. 炮击，轰炸；

例句
Weeks of aerial bombardment had destroyed factories and highways...
数周的空中轰炸已经摧毁了许多工厂和公路。