N-COUNT If there is an undertow of a feeling, that feeling exists in such a weak form that you are hardly aware of it, but it influences the way you think or behave. 暗流 [usu with supp]
...an undertow of sadness.
...一股悲伤的暗流。
N-COUNT An undertow is a strong current of water that is moving below the surface current and in a different direction to it. 潜流
When he tried to attend her birthday party last March, the flatbed tow truck got caught under an underpass.
去年三月份，当他想参加她的生日派对的时候，他的平板式拖车被卡入地下道内。
Raise the front of the vehicle off the ground and install tow dollies under front wheels.
将车辆前方举起离地，在前轮下安装两个拖曳支架。
Under the assumption of only tow kinds of mobile alkali ions in glass, a model for the metal glass electric field assisted anodic bonding is proposed.
在假设玻璃中仅有两种可动碱金属离子的情况下，提出了一个金属玻璃电场辅助阳极连接模型。
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