1.他还没有习惯于骑马
He has not been [used/accustomed to] riding a horse.
2.他不怕麻烦,想方设法来为所有的旅客服务
He goes out of [the way] to think of ways to serve all the passengers
3.鸽子是和平的象征
The dove is the [symbol of] peace
5.刚开始的时候,我对工厂的一切都很陌生
At the beginning, everything in the factory was very [alien to] me