VOA慢速英语:US Troops to Remain in Afghanistan, Deploy to Cameroon

bottom line – expression conclusion; final decision

key – adj. extremely important

fragile – adj. not strong

deterioration – n. the act or process of becoming worse

core – v. describing the most important or basic part of something

adjustment – n. a change, often small, that improves something or makes it work better

ramp up – expression to increase the size or amount of something; to increase the volume, amount, or rate of something

presence – n. the fact of being in a particular place

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