词从单阙发展为两阙,凡是下阙开始处的句式与上阕开始处不同的，这叫做换头。
大号可换头螺丝起子 large bit driver
备用小气瓶转换头 SPARE AIR ADAPTER
换头喷嘴 nozzle with removable head
转换头 adapter
可换头防静电镊子 Stainless steel tweezers ; anti-static tweezers
高接换头 grafting high and changing head
无反光镜可换镜头相机 Mirrorless Interchangeable-Lens Camera
改头换面 Extreme Makeover ; Transformation
快换接头 quick release coupling ; Quick joint ; quick change coupler ; Quick-connector
可靠替换弹头 RRW
我出了一头牛换它。
“我应该在这桩交易里得到点什么，”农夫说，“用一只肥鹅换一头猪，真的！”
"I ought to have something into the bargain," said the countryman; "give a fat goose for a pig, indeed!"
计算得出，由于热流计测头的出现，对流换热系数的变化会给热流测量带来较大误差。
Conclusions can be drawn that changes of the convective heat transfer coefficients can bring error because of the appearance of heat flux sensors.
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