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.
Theory is a coherent unity which explains the phenomena. On the other hand,

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。
名詞子句：
1.主詞－兩個獨立的單句

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)

made of/made from (直接/間接)關係
between/among (有標示位置/沒有標示位置)
ex: Taipei lies between Taoyuan, Yilan and Keelung.
throw to(方向)/ throw at (點/目標物)
from...to(沒有講明確切時點)
The circus will be here four months, from May to September.
from...through(包括頭尾在的內的完整時間)
The circus will be here five months, form May through September.
above/below (相對高度超過／低於)
over/under (表明特定位置)