大多没情况下光滑剂是需要的，以便维持某种化学均衡，否者就会有腐蚀。

Most lubricants are necessary, to maintain a certain chemical balance, or there is corrosion.

youdao

健康的皮肤自然情况下是酸性的。止血收敛剂和爽肤水男女都可以用来保持皮肤的光滑。

Healthy skin is naturally somewhat acidic: astringents and toners are used by both genders to keep their skin smooth.

youdao

触感柔软，光滑，以便它的令人难以置信的准备，而且非常的润肤剂和有效保护。

It feels so soft and smooth going on it's unbelievable, and it's very effective as emollient and protection.

youdao