Pitprop
n. 坑木, 坑道支柱
🗣️ 情景例句
The only-child generation brings about many new social problems.
独生子女一代带来了许多新的社会问题。
We must have your LC at least one month before the time of shipment.
我们必须在船运前一个月收到你们的信用证。
The world had to wait almost another 100 years for the Channel Tunnel.
世界不得不再等将近100年才看到海峡隧道竣工。