1.i think the microwave oven is the (two) most helpful invention2_英语解答

1.i think the microwave oven is the (two) most helpful invention
2.i think the light bulb is (use)invention of the four.

人气：350 ℃　时间：2019-08-20 13:04:42

解答

1.second (第二有用)
2.the most useful （最有用）能请你翻译一下第二个句子吗？我认为灯泡是四个发明中最有用的一个。