zhè / bǎ / xǐ / dāo / xū / yào / dìng / qī / gēng / huàn / cái / néng / bǎo / zhèng / jiā / gōng / jīng / dù

这把铣刀需要定期更换，才能保证加工精度。

This milling cutter needs to be replaced regularly to ensure machining accuracy.