@0bj3ctivity @MichaelSFuhrer Not all of the reportedly low effectiveness of masks in reducing overall transmission comes from the low quality of the masks themselves. Some of it comes from transmission happening in unmasked settings.
(cont)
@0bj3ctivity @MichaelSFuhrer 据报道，并非所有口罩在减少整体传播方面的低效都来自口罩本身的低质量。其中一些来自在未屏蔽环境中发生的传播。
（续）