1. a heavy-duty knife with sawtooth serrations.
   带锯齿的厚实耐用刀。
2. a saw-toothed mountain range; a sawtooth curve.
   蜿蜒的山脊；锯齿般的曲线
3. the sawtooth austenite boundaries become preferential nucleation sites of ferrite, and the sawtoothed ferrite boundaries contribute to the formation of ferrite recrystallization nucleus.
   锯齿状的奥氏体晶界优先成为铁素体的形核位置;

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