square cast iron gas welding rod

例句：

1. 1.The table is square, so it can fit in the corner of the room.
   桌子是正方形的，所以它可以放在房间的角落里。
2. 2.The square of a number is the number of times that number multiplied by itself.
   一个数的平方是那个数乘以它自己的次数。
3. 3. The square root of 64 is 8 because 8 x 8 = 64.
   64的平方根是8，因为8 x 8 = 64。