Energy sources
[經] 能源來源
?? 詞語組成解析
n. 輸入源；發起者；來源（source的復數）
??? 情景例句
I heard the professor of that class is very good.
我聽說那個班的教授很好。
I know the boy whose father is a college president.
我知道那個男孩的父親是大學校長。
The day after tomorrow will be sunny.
后天轉晴。