wooden pump logs 木制溢流导管
它是木制作出记录。
The first Bridges made by humans were probably spans of cut wooden logs or planks and eventually stones, using a simple support and crossbeam arrangement.
而人造桥则是由切段原木或是厚木板、石头搭建起来并用横梁做支撑的拱。
On the top of each was a hole, the edges of which were defined with twisted logs, set flush into the ground, like wooden lips.
在每一个土堆顶上都有一个洞，旁边都用一些被弯曲的木头围住，水就经过那个流在地上，这些木头就好像木嘴唇一样。
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