Fluorin can avoid brown striation and whiten skins.氟:能消除褐色斑,使皮肤变白.The free fluorin content in liquid multi - vitamin was quantitatively analyzed by using a simple potentiometric titration.使用简单的电位滴定法定量分析维生素中游离氟的含量.It is c...
我设法对父母瞒下了此事。I managed to keep my parents in the dark about this.她知道加布里埃尔有事瞒着她。She knew that Gabriel was keeping something from her.他们拼命想要瞒住这桩婚事。They were desperate to keep the marriage hush-hush....