To answer the first part of your question, I'd like to say that our studies were very extensive.
你问题的第一部分,我要说的就是我们的研究非常广泛。
I like spring and summer.The days are long and the night are short.The sun rises early and sets late.
我最喜欢春季和夏季。因为此时白天长而夜晚短,太阳升得早而落得迟。