Pop a letter in the post standard pitch roller chain.
把信一下子投进邮筒标准节距套筒滚子链
They don't seem to understand that this is a business, not a chain letter game.
他们似乎并不明白这是生意，不是连环信游戏。
Corresponded letter the technical development to also raise the level of the chain management biggest.
通信技术得发展也极大地提高了供应链管理得水平。
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