2 sentences

1. 这条导轨需要定期涂抹润滑油。

   zhè tiáo dǎo​guǐ xū​yào dìng​qī tú​mǒ rùn​huá​yóu.

   This guide rail needs to be lubricated regularly.

   Source: Dong Chinese Dictionary

2. 工程师正在测量两根导轨的对接间隙。

   gōng​chéng​shī zhèng​zài cè​liáng liǎng gēn dǎo​guǐ de duì​jiē jiàn​xì.

   The engineer is measuring the joint gap between the two guide rails.

   Source: Dong Chinese Dictionary