soft launch
noun [ C ] business specialized uk/ˈsɒft ˌlɔːntʃ/ us/ˈsɑːft ˌlɑːntʃ/
（产品、服务、公司等处于试运行阶段，只对有限数量的人士开放的）软启动，软上线
an occasion when a product, service, or business is made available or opened for the first time, but only to a limited number of people at first
A soft launch is the best way to optimize your app or game for its later widespread release. 软启动是优化应用程序或游戏的最佳方式，以便日后广泛发布。
Compare: hard launch