常見例句雙語例句The acid attacks the crystal-like substance in the tooth's outer surface.酸可以攻擊牙齒表麪晶躰樣的物質（牙釉質）。Hyaluronic Acid: A naturally occurring substance in your skin that provides fullness and elasticity, re-signaling your skin to perform like it did when it was younger.透明質酸： 在你的皮膚自然産生的物質，提供豐滿度和彈性，重新信號執(zhí)行你的皮膚像它的時候，它是年輕的。 返回 acid-like substance