单词：frets
n a spot that has been worn away by abrasion or erosion
n an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)
n a small bar of metal across the fingerboard of a musical instrument; when the string is stopped by a finger at the metal bar it will produce a note of the desired pitch
v worry unnecessarily or excessively
v be agitated or irritated
v provide (a musical instrument) with frets
v become or make sore by or as if by rubbing
v cause annoyance in
v gnaw into; make resentful or angry
v carve a pattern into
v decorate with an interlaced design
v be too tight; rub or press
v cause friction
v remove soil or rock
v wear away or erode
frets的用法和样例：
例句
- Don't fret, we'll get there on time.别着急,我们能准时到那里。
- Fretting about it won't help.发愁於事无补。
- Babies often fret (themselves) when their mothers are not near.婴儿常常因母亲不在身边而哭闹。
- You are fretting yourself needlessly.你是在不必要地折磨自己。
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