N-COUNT
同伴;伴侣;同行者
A companion is someone who you spend time with or who you are travelling with.
例句
Fred had been her constant companion for the last six years of her life...
在她生命的最后6年，弗莱德一直是她忠实的伴侣。
I asked my travelling companion what he thought of the situation in Algeria.
我问我的驴友对阿尔及利亚的形势有什么看法。