中文翻译与英英解释

1.半拖车接轮；转向轮；试验(汽车行车距离的)专用轮。
2.备用轮。
3.多余的人[物]。

fifth:    n. 1.〔美国〕五分之一加仑(瓶)。 2.每月的第五日 ...

wheel:    n. 1.轮，车轮；轮状物。 2.〔口语〕脚踏车；【造船 ...

a steering bearing that enables the front axle of a horse-drawn wagon to rotate

an extra car wheel and tire for a four-wheel vehicle
同义词：spare,

someone or something that is unwanted and unneeded
同义词：deadwood,

例句与用法

Semi - trailer tractors - fifth wheel mounting
半拖挂车牵引车.试验专用轮的安装

Road vehicles - fifth wheel kingpins - strength test
道路车辆.第五轮中枢销.强度试验

Road vehicles - fifth wheels - interchangeability
道路车辆.第五轮.互换性

Motor vehicles - fifth wheel coupling pins - strength test
汽车半挂车牵引座牵引销强度试验

Fifth wheel lead for calculation of length
长度计算用牵引座前置距

Commercial road vehicles - fifth wheel couplings - strength tests
商用道路车辆.第五轮联轴器.强度试验

Shapes and dimensions of fifth wheel coupling pins for semi - trailers
半挂车用试验专用轮联接销的形状和尺寸

Specification for dimensions of ' 50 ' fifth wheel king pin for semi - trailers
半挂车第五轮大号销钉" 50 "尺寸规范

Standard test method for measuring length of road test courses using a fifth wheel
利用备用轮测量道路试验线路长度的标准试验方法

Fifth wheel method
五轮仪法