millstone /ˈmɪlˌstəʊn/

• 1. 

  N-COUNT A millstone is a large, flat, round stone which is one of a pair of stones used to grind grain into flour. 磨石; 磨盘

• 2. 

  PHRASE If you describe something as a millstone or a millstone around your neck, you mean that it is a very unpleasant problem or responsibility that you cannot escape from. 重担; 包袱 [usu v-link PHR] [表不满]

  例：

  For today's politicians, the treaty is becoming a millstone.

  对今天的政治家而言，该条约正成为一大包袱。

  例：

  That contract proved to be a millstone around his neck.

  那个合同果真成了他的一个沉重负担。