慢速英语:Obama Permits Military Weapons Sales to Vietnam

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1. strengthen vt.加强，巩固; 勉励，激励
例句：This lignification serves to stiffen and strengthen the cells.
木质化足以使细胞变硬和增强。

2. cooperate vi.合作，配合，协助
例句：This fully demonstrates their willingness to cooperate.
这充分表明他们愿意合作。

3. defend vt.保卫; 辩护
例句：We must defend our country.
我们必须保卫我们的国家。

4. conducive adj.有助于…的
例句：Fresh air is conducive to health.
新鲜空气有利于健康。

5. remain vi.保持; 依然; 留下
例句：Nobody wants to remain a beginner.
没有人愿意停留在新手级别。