serve as充当, 担任
例句：The general had served as a soldier in the earlier war.
在早期的战争中, 这位将军曾当过士兵。
2. He pledged that after he took office, together with his political team and public servants, he would set a good example and run an honest and clean government.
take office就职
例句：He took office at a difficult time.
他是在困难时刻就职的。
3. "I hope he can improve people's livelihoods; for example, introduce more medical welfare."
for example例如, 譬如
例句：There are many sources of air pollution; exhaust fumes, for example.
空气污染有许多来源, 例如废气。
