1.i think the microwave oven is the (two) most helpful invention2.i think the light bulb is (use)invention of the four.

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1.i think the microwave oven is the (two) most helpful invention2.i think the light bulb is (use)invention of the four.
1.i think the microwave oven is the (two) most helpful invention
2.i think the light bulb is (use)invention of the four.

1.i think the microwave oven is the (two) most helpful invention2.i think the light bulb is (use)invention of the four.
1.second (第二有用)
2.the most useful (最有用)

1.second
2.the most useful

second;the most useful

1. l think the microwave oven is the second most helpful invention。
我认为微波炉是第二有用的发明物。
2.l think the light bulb is the most useful invention of the four.
我认为电灯是四个发明物中最有用的。
希望有帮助!