Huge ice sheets were formed.是什么意思？

Huge ice sheets were formed.

巨大的冰层形成了。

huge

adj. 巨大的，庞大的，极大的；

例句
Thousands of farmers from across Europe have held a huge demonstration in the centre of Brussels...
来自欧洲各地的数千农民在布鲁塞尔市中心举行了大规模的示威游行。

ice

n. 冰，雪糕，冷淡，冰状物；vt.& vi. （使）结冰；vt. 结冰，冰镇；vi. 结冰；adj. 冰的；

例句
He asked for ice for his whiskey and proceeded to get drunk.
他要求给他的威士忌里面加冰，接着喝得大醉。

sheets

n. 纸( sheet的名词复数 )，被单，一张（通常指标准尺寸的纸），一大片（覆盖物）；

例句
He picked up the sheets of paper, and balled them tightly in his fists...
他抓起那几张纸，在手里紧紧攥成团。

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。

formed

adj. 成形的，成形加工的；v. 形成，构成，产生( form的过去式和过去分词 )，是，（使）成形，结成（友谊）；

例句
A frown formed between her arched brows.
她皱起两道弯眉。