口罩的功效

人們通常從以下幾個方面來測試口罩是否好用。

▌Comfort 舒適性

例如：

?These masks are usually very comfortable on the face. But their straps go behind the head and not around the ears, which is less practical for many users.
這些口罩佩戴起來通常很舒服，但是帶子是箍在頭上，而不是耳戴式，所以對有些人來說不是很好用。

?This mask is usually very comfortable but the plastic edges can leave skin indentations which last longer than other softer masks.
通常來講，這種口罩佩戴起來很舒適，但是塑料邊緣會在皮膚上留下印記，和其他柔軟材料的口罩相比，印記消掉要花更長的時間。

▌Air leaking 密封性

例如：

?There is very little leaking if the metal nose bridge is properly pinched together.
如果把金屬鼻夾夾緊的話，空氣幾乎不會漏進來。

?This mask is not quite as snug as some others and I did occasionally smell street odors.
這款口罩不如其他一些口罩那么貼合，我有時候能聞到街道上的氣味。

▌Exercising 運動時使用

例如：

?I found it very comfortable to breathe while biking, especially if the model has an exhalation valve.
我覺得戴著這種口罩騎車呼吸十分暢通，尤其是帶呼吸閥的那種型號。

?The fabric gets soggy during exercise. I also found it harder to take deeper breaths.
布料會在運動過程中浸濕，而且要深呼吸也很困難。

?I had no problems during biking or jogging with this mask and still felt able to catch a breath.
戴著這款口罩騎自行車或跑步都不成問題，還能喘得上氣。

▌Fog factor 眼鏡是否起霧

例如：

?I had very little fogging of my glasses with a good seal around the nose.
由于鼻子周圍十分密封，所以眼鏡上幾乎不會起霧。

?Sometimes the nose fit isn’t perfect and my eyeglasses fog up.
有時候鼻子部分不是很貼合，我的眼鏡就起霧了。

▌Longevity 使用壽命

例如：

?The mask can last at least a few days of use before losing effectiveness.
這種口罩在持續使用幾天后才會失效。

?The mask itself can last for years, and you just pop in a new filter every few days.
口罩本身可以使用多年，你只要隔幾天放一個濾芯進去就行了。

有用的句子

最后學一些談論口罩的有用句子。

?I only strongly recommend truly N95-certified masks such as 3M and Vogmask.
我只強烈推薦真正通過N95認證的口罩，比如3M和Vogmask。

?The only masks that are worth buying are the N95 type.
唯一值得買的口罩就是N95的。

?If you want to protect yourself against the minuscule particles you'll need professional masks. Very pricy and inconvenient to wear.
如果你想抵抗住微顆粒，就必須使用專業面具，很貴，而且佩戴不便。

?After about 2-3 weeks of use, the mask looks horribly grey!!
用了兩三周后，口罩都變灰了，可嚇人！

?I've noticed that counterfeit/fake masks are a huge problem in China, and I was wondering where will I can purchase authentic 3M masks in Beijing.
我發現中國各種假冒偽劣口罩是個大問題，不知道北京哪里能買到3M正品呢。

?Many masks aren’t good for heavy breathing such as I would do while running.
有些口罩在呼吸沉重的時候，比如跑步的時候，戴著不是很適合。

?The filter life span is said to be 69 hours, so assuming that you bike 1 hour every day, that's 3 month use for one filter - not so bad.
一個濾芯的壽命據說是69個小時，假設你每天騎一小時車，那一片濾芯就可以用3個月，挺不錯。

?It sometimes takes a bit of fine tuning the metal nose clip for a good seal.

有時候要稍微調一下鼻夾，才能達到好的密封效果。
?Air pollution is such a serious issue that we really need to stick with the best masks — with proven results from independent labs, not just TV advertorials and website testimonials.
現在空氣污染太嚴重，我們真的要用最靠譜的口罩才行，得有獨立實驗室的檢驗報告，而不是電視廣告和網站上貼的各種證書。

（來源：中國日報網雙語新聞微信，編輯：左卓）