@Darren_Young_A @dianaberrent @Delta 1. Dumb policy, valves aren't that bad https://www.cdc.gov/niosh/docs...
2. Dumb design, valve-less model should be more visually distinctive. Another issue is user with access to both may accidentally pick up and use the wrong one.
@Darren_Young_A@dianaberrent@Delta 1。愚蠢的政策，阀门没那么糟糕https://www.cdc.gov/niosh/docs...
2.哑巴设计，无阀型号应更具视觉特色。另一个问题是，同时访问两者的用户可能会意外地拿起并使用错误的一个。