add..to.“给…增加” e.g. We added a few more students to the class. 我们给这个班级又增加了几个学生。 add fuel to the fire/flames“火上浇油”； add insult to injury“雪上加霜” add to:to make a quality more extreme“加剧” e.g. Her classmates'laughter only added to her embarrassment. 同学们的笑声使她更尴尬了。add...to...: “给······增加······” e.g. We added a few more students to the class. 我们给这个班级又增加了几个学生。 add fuel to the fire/flames “火上浇油” ； add insult to injury “雪上加霜” add to: to make a quality more extreme “加剧” e.g. Her classmates’ laughter only added to her embarrassment. 同学们的笑声使她更尴尬了