Now, all that one has to do is rub the stick against the gum twice, once against the upper jaw and then on the lower jaw, from one end to another, to collect oral mucosal transudate fluid, normally secreted in the oral cavity.
Now, all that one has to do is rub the stick against the gum twice, once against the upper jaw and then on the lower jaw, from one end to another, to collect oral mucosal transudate fluid, normally secreted in the oral cavity.
现在，这一切只要用一个棒摩擦牙龈两次，第一次贴着上颚，接着贴着下颚，从一边到另一边去收集口腔粘膜渗出液，通常在口腔秘密的分泌。