Based on the relative timelines of these efforts, this meant we needed to continue to add new functionality to internal builds of the live-service game to meet certain publisher milestone requirements despite the fact that when these features would ultimately get released to the player it would be in the offline game. As a result, we needed to continue to build out and deploy new backend functionality in our internal development environments that would never actually need to be deployed to live player-facing production environments.
if (res === '') res = '0';，这一点在爱思助手下载最新版本中也有详细论述
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（一）原值不超过500万元的单项长期资产，对应的进项税额可以全额从销项税额中抵扣；