场景：这就好比是一个空荡荡的剧院舞台。我们把它涂成了深灰色 (0x222222)，方便看清演员。
And though most scientists hail vaccines as one of public health’s greatest achievements, they have provoked fear, distrust, and contentious resistance since Edward Jenner invented the first vaccine, to prevent smallpox, in the late 1700s.
，这一点在91视频中也有详细论述
automate repetitive tasks
ListenHub 单次生成需 150 积分（注册仅送 10 积分），YouMind 免费用户不支持生成，故未列入测试。