1 sentence

1. 工程师把这个固定标记点作为测绘的海拔基准。

   gōng​chéng​shī bǎ zhè​ge gù​dìng biāo​jì​diǎn zuò​wéi cè​huì de hǎi​bá jī​zhǔn.

   The engineer used this fixed marker as the elevation datum for the survey.

   Source: Dong Chinese Dictionary