Do you remember the rubber band on the back of that mask?

还记得面具后面的橡皮筋不？

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This product is cutted, folded, sewed by the medical absorbent gauze and mask band.

该产品用医用脱脂纱布，加口罩带，裁切、折叠、缝制而成。

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Experiments on simultaneous mask effect where tones were masked by narrow-band noises with different SPL showed that the masking curve could be approximated as two segments of straight line.

不同声压级下窄带噪声对纯音同时掩蔽效应的实验结果表明：掩蔽曲线可以用两段直线来近似。

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Remember the rubber band on the back of that mask?

还记得面具后面的橡皮筋不？

哈佛公开课 - 幸福课课程节选

Dave Lesser, lead singer of the band Brenda, pledged to wear his face mask at every protest until the band is free.

CNN: DC punk bands perform in support of jailed rockers