难度：**
tweak 扭，微调 I tweaked the settings on my amplifier to get a warmer sound.
grouse 和 grumble 区别：grouse指对一些小事情不停地发牢骚 ，grumble 强调“低声嘟囔”，不一定公开抱怨。
He is always grumbling about low speed driving on street for others.
He is always grousing about the sweltering weather.
inherent 内在的，固有的 inherent territory of china 中国固有领土