groove

n. 凹线，（刻出的）线条，习惯

grit, grits, grittiness, gritty, grizzle, grizzled, grizzly, Gro, groan, groats, grocer, groceries, grocery, grog, groggily, grogginess, groggy, groin, grommet, groom, grooved, groovy, grope, gropingly, gross, gross national product, grossly, grossness, grotesque, grotesquely, grotesqueness, grotto, grotty, grouch, grouchy, ground, ground control, ground crew, ground floor, ground rule,