by 相当于汉语“了” rise by about 7 degrees centigrade 上升了大约7度 increase by 是增长了..， by 后面接的是百分数，倍数或幅度。你确定？那 The earth will perhaps be warmer by about 7 degrees centigrade at the South Pole and the North P...
by是介词，表示增减的幅度。如： If something increases or decreases by a particular amount, that amount is gained or lost.The earth will perhaps be warmer by about 7 degrees centigrade at the South Pole and the Nort...
