Since the intensification of urbanization, it not only brought great economic benefits, but also the population explosion, excessive building density, terrible traffic jam, and other problems.

城市化进程的不断加剧，在产生巨大经济效益的同时，也带来了城市人口膨胀、建筑密度过大、交通严重堵塞、环境持续恶化等一系列的问题。

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The higher density of the foam is the better. Check the foam particle frequently, if its size is not uniform, maybe some problems happened, e. g., jam in the pipe, leakage or mechanical trouble.

发泡时泡沫颗粒应愈绵密愈好，应随时注意发泡颗粒是否大小均匀，反之，必有发泡管阻塞、漏气或故障。

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