glass tube protector的用法和样例：
例句
- Every fiber-optic cable used for networking consists of two glass fibers encased in separate sheaths.
使用来连网的每个光纤电缆是由包装在分开的保护套内的二条玻璃纤维组成。 - Soil volumetric water content was measured by employing the metallic tube of the tensiometer as an antenna, whose radiating impedance varied as soil water content.
将张力计中的一段金属保护套管作为天线，利用其辐射阻抗随着土壤含水率变化的规律来测量土壤容积含水率。
