Torpedo rays (Torpedo californica) are identifiable by their flat gray bodies and black spots.
电鯆（电鳐）可以通过他们扁平的灰色身体和黑色斑点被认出来。
I don't know how many times I have stopped on the side of the road to help someone fix their flat tire so they could continue on with their lives safely.
我已经不记得多少次我停在路边去帮助别人去处理他们漏了气的轮胎，好让他们安全地继续他们的行程。
Compared with railway tunnels, the span of highway tunnels is large and their flat ratio is low.
与铁路隧道相比，公路隧道跨度大，扁平率低，开挖多采用分部法。
Compared with railway tunnels, the span of highway tunnels is large and their flat ratio is low.
与铁路隧道相比，公路隧道跨度大，扁平率低，开挖多采用分部法。
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