【正文】
Half fill a test tube with water. (2) Boil the water for three minutes. (3) Put two or three nails in the water. (4) Add some oil to the water. This will keep air out of the water. (5) Leave the tube for one week. react with sth. 與 …… 發(fā)生化學反應 react to sth. 對 …… 反應 1. react vi. (化學 )反應 reaction n. (1). 你認為鈣會與水發(fā)生反應嗎? Do you think calcium reacts with water? (2). 他對那消息沒有反應。 He didn39。t react to the news. add… to … 把 …… 加入 …… add to 增加 add up to 總計是 eg. 火上澆油 If you add three to seven, you get ten. These newlybuilt gardens add to the beauty of the city . 這些新建的公園增添了這個城市的美麗。 這些數(shù)字加起來總計是 50。 These numbers add up to 50. add oil to the fire keep……out of 使 …… 不進入 Keep the dog out of the room. 不要讓狗進入房間。