As a weaker economy accelerates declining circulation trends, it is becoming harder for publishers to persuade advertisers not to cut their spending on print.
随着经济走软加速了发行量下降的趋势，出版商想说服广告客户不要削减印刷开支变得愈加困难。
Dual string provides a new fluid circulation way and accelerates the velocity of liquid quickly, improving the efficiency.
双层管柱提供了新的液流通道，同时加快了携砂液返速，提高冲砂效率。
Dual string provides a new fluid circulation way and accelerates the velocity of liquid quickly, improving the efficiency.
双层管柱提供了新的液流通道，同时加快了携砂液返速，提高冲砂效率。
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