... invert，底拱 irrigation tunnel，灌溉洞 mid-gate chamber，中闸室 ...
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灌溉隧洞 irrigation tunnel
灌溉洞
Irrigation tunnel
以上为机器翻译结果，长、整句建议使用 人工翻译 。
下一张是该洞建成后的照片。今年主要的灌溉系统重新安装完成后，将会增加漏掉的两个沙坑。
This next photo is what was built. The two missing bunkers are to be added this year, after a major irrigation line is relocated.
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