the first (second…etc.)time 相當(dāng)于一個連詞，常引導(dǎo)一個表示時間的狀語從句，意為“第一(二……等)次做某事的時候”。
This is the second time that I have visited China.
這是我第二次來中國。
he first time he came to Shanxi, he visited Taiyuan.
他第一次來山西時，曾游覽了太原。
2. Mencius believed that the reason why man is different from animals is that man is good.
孟子認(rèn)為人不同于動物的原因是人是善良的。
在the reason why…is that…(……的原因是……)這一句型中，why引導(dǎo)的是定語從句，修飾先行詞reason；that引導(dǎo)的是表語從句，說明reason的具體內(nèi)容。
The reason why some people died young is that they didn't care much about their health.
一些人早逝的原因是他們不愛護(hù)自己的身體健康。