深度 + 为 + Number + Unit
深度 (shēndù) is a noun meaning "depth," used to describe how deep something is, whether in a physical, intellectual, or abstract sense. It often appears with 为 (is/measures) when stating a specific measurement.
这条河的深度大约为三十米。
Zhè tiáo hé de shēndù dàyuē wéi sānshí mǐ.
The depth of this river is approximately thirty meters.
这篇文章很有深度,值得反复阅读。
Zhè piān wénzhāng hěn yǒu shēndù, zhíde fǎnfù yuèdú.
This article has great depth and is worth reading repeatedly.
潜水员需要了解水下的深度变化。
Qiánshuǐyuán xūyào liǎojiě shuǐxià de shēndù biànhuà.
Divers need to understand the changes in underwater depth.