管长

zhè ge shū sòng guǎn guǎn cháng mǐ

这个输送管管长50米。

The length of the feeder pipe is 50m.

shí guǎn guǎn cháng yǔ shēn cháng de xiāng guān xìng

食管管长与身长的相关性

the relativity of the length of esophagus and thestature