这只狗非常喜欢它的主人，因为主人是个温柔的抚摸者。

The dog loves its owner very much because he is a gentle ___stroker.

这台发动机的活塞运动非常平稳，得益于它精密的冲程装置。

The engine's piston moves smoothly thanks to its precise ___stroke mechanism.

别被她骗了，她是个操控高手，总能用甜言蜜语得到想要的东西。

Don't be fooled by her—she's a master ___manipulator who always gets what she wants with sweet talk.