But it's superfluous, really-which is why calling someone a "fifth wheel" is a way of calling them unnecessary, basically a tagalong.
但它是多余的，真的- - -这就是为什么将一个人称作“第五轮”是指他们无用，根本是个跟屁虫。
And the appropriate control position of shift gear and the fifth wheel can ensure safe and efficient control.
变档和第五轮控制位置恰当，确保安全及高效控制。
The tractor frame uses super-long fifth-wheel pick-up plate as well as plate reinforced cross member.
牵引车车架采用了超长的鞍座连接板及连接板加强横梁。
I don't like living with my son and daughter-in-law. I feel like a fifth wheel.
我不喜欢和我儿子儿媳妇一起住，我觉得我很多余。
I don't like living with my son and daughter-in-law. I feel like a? Fifth wheel.
我不喜欢和我儿子儿媳妇一起住，我觉得我很多余。
The evertible reinforced fifth-wheel pick-up plate is introduced on the reinforced frame. The adoption of two-layer fifth-wheel pick-up plate enables it carry more load.
并在加强型车架上增加了外翻式加强鞍座连接板，双层鞍座连接板的采用，使其更具有超强的装载能力。
My son asked me to come help at his school track meet but I felt like a fifth wheel when I got there: they already had enough people to help so I just stood there feeling useless.
我的儿子要我在他学校开运动会的时候去帮忙。可是，我到了那里觉得自己似乎是多余的，因为他们已经有好多人在帮忙，我只好站在那里没事干。
My son asked me to come help at his school track meet but I felt like a fifth wheel when I got there: they already had enough people to help so I just stood there feeling useless.
我的儿子要我在他学校开运动会的时候去帮忙。可是，我到了那里觉得自己似乎是多余的，因为他们已经有好多人在帮忙，我只好站在那里没事干。
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