What's the meaning of the first two sentences？

Read the quoted parts carefully and answer the questions in English.When the stars threw down their spears,
And water'd heaven with their tears,
Did he smile his work to see？
Did he who made the Lamb make thee？

Tyger！Tyger！Burning bright
In the forests of the night,
What immortal hand or eye
Dare frame thy fearful symmetry？
What's the meaning of the first two sentences？
【正确答案】：

WHEN THE SMITH IS HAMMERING THE HEATED METAL, THE FIRST SPARKLES LIKE THE SHOOTING STARS WHICH ARE OFTEN CALLED AS ANGLES' TEARS BY CHILDREN.

【题目解析】：前两句的意思是：当铁匠锤击加热的金属时，第一道火花像流星一样闪烁，孩子们常称之为天使的眼泪。