emerge to appear, or to become recognized
'emerge'是“显现” “露出”的意思，，但是写英语的时候可能很少会想到它。其实它和“appear”一样，是个常见不及物动词。
emerge'前的主语经常是“问题” “挑战”。
例句：
As we age, specific health problems emerge.
As children approach their adolescence, new challenges emerge.
As we age, specific health problems emerge.
Problems emerge and some people try to sweep them under the rug.
From office dialogues, stories emerge.
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3. 作业
1）翻译:老问题一直都存在，新问题也开始暴露出来。
Old problems remain, and new problems are about to emerge.
2）场景：人们享受共享单车的便利的同时，新的问题开始显现
As people enjoy the convenience of bike-sharing, new problems emerge.
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