gěi / hái zi / lǐ fà / qián / wǒ / xiān / bǎ / lǐ fà qì / de / dāo tóu / xiāo dú / zài / tiáo dào / hé shì / de / cháng dù

给孩子理发前，我先把理发器的刀头消毒，再调到合适的长度。

Before cutting my child's hair, I disinfect the clipper's blade and then adjust it to the appropriate length.