今日单词:
1. subsistence
n. 勉强维持生活, 存活; 生计
The standard of living at that time was on the edge of subsistence.
2. exist
v. 存在; 生存
Most scientists believe that water doesn't exist on the surface of the moon.
3. exterminate
v. 消灭, 根除
We've made great efforts to exterminate mosquitoes and flies.
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