assassin n.

1. N-COUNT An assassin is a person who assassinates someone.

maim vt./n.

1. VERB To maim someone means to injure them so badly that part of their body is permanently damaged.

contrite adj.

1. ADJ-GRADED If you are contrite, you are very sorry because you have done something wrong.

haystack n.

1. N-COUNT A haystack is a large, solid pile of hay, often covered with a straw roof to protect it, which is left in the field until it is needed.
2. PHARSE If you are trying to find something and say that it is like looking for a needle in a haystack, you mean that you very unlikely indeed to find it.

immigrant n./adj.

1. N-COUNT An immigrant is a person who has come to live in a country from some other country.

ethnology n.

1. the scientific study and comparison of different races of people.

simultaneously adv.

aristocrat n.

1. N-COUNT An aristocrat is someone whose family has a high social rank, especially someone who has a title.

salinity n.

saline adj.

1. ADJ A saline substance or liquid contains salt.

memetor n./abbr.

1. N-COUNT A meteor is a piece of rock or metal that burns very brightly when it enters the earth's atmosphere from space.

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来源： https://www.cnblogs.com/xiaoheng2020/p/12867319.html