Also introduced here are the mixture ratio and design of pavement, base, sub-base, sub-seal and old road strengthening for typical pavement structure of different road classes in Zhengzhou.

同时，还对近阶段郑州市不同道路等级典型路面结构的面层、基层、底基层、下封层和旧路补强的配比和设计作了详细的介绍。

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An effective acoustic seal allows for a high level of sound isolation, further reinforcing the headphones' powerful sub-bass reproduction.

ENGADGET: Sony ships new Extra Bass headphone lineup to the US, delivers that Direct Vibe to your brain