Zhè / zhī / lǎo / bù / qiāng / de / qiāng / gǎn / zi / yǐ / jīng / shēng / xiù / le / xū / yào / sòng / qù / bǎo / yǎng

这支老步枪的枪杆子已经生锈了，需要送去保养。

The barrel of this old rifle has rusted and needs to be sent for maintenance.