Language Point 58
The unconscious is certainly the source of instinctive activity. (Para. 7)
source: n. a place from which sth. comes or is acquired
The source of water for our watering network is the river near our farm.
我們灌溉系統(tǒng)的水源是農(nóng)場(chǎng)附近的那條河。
The farms in the country are the source of food for the cities.
鄉(xiāng)村農(nóng)場(chǎng)是城市所需食品的來(lái)源。