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The two cities of Deyang and Mianyang were the most seriously hit when a tunnel(隧道,地道) five kilometers from Mianyuang collapsed(倒塌,崩溃).
In Deyang, the rainfall has hit 367 millimetres and in Mianyang, 304 millimetres, around the annual total for most parts of North China.
参考答案:当距绵阳五公里处的一个隧道倒塌时,德阳和绵阳这两个城市严重受到打击。
在德阳，降雨量已达367毫米而绵阳也已达到304毫米，合起来大约是华北大部分地区的年降雨量总和。