Substantianigra
黑質(zhì)
??? 情景例句
Call the plumber to fix the toilet.
給水管工打個電話來修理廁所。
If there were no clouds, we should not enjoy the sun.
吃得苦中苦，方知甜中甜。
But animals of this age do not easily become subservient to man,
但這個年齡的象不易馴服，