Be a man

Since sociology separated from philosophy, theory has its own specific
meaning in this discipline. In etymology, theory means "a looking at,
viewing, contemplation". Theory is a viewpoint, not a practice. In addition,
theory emphasizes the systemic and logical connection between concepts.

複句合句結構
Compound sentense合句，又稱對等子句，沒有主從之分。
Complex sentense複句。可分為名詞子句、形容詞子句(有重複元素)、副詞子句。

介系詞片語，由介系詞加上一個名詞片語所構成的意義單元(p172)
空間的介系詞：點(at)，線(on,along)，面(on)，體(in)
時間的介系詞：點(at)，長時間(in)，特定日期(on)