nickel rondelle

例句：

1. 1.This necklace is made of nickel.
   这条项链是用镍制成的。
2. 2. Nickel is a soft metal that can be easily scratched.
   镍是一种柔软的金属，很容易刮伤。
3. 3.The nickel in the coin was stolen by a thief.
   硬币中的镍被一名小偷偷走了。