black out level

基本解释

Either way, I always wonder if there is such a huge demand for black market library cards that it justifies out level of concern? I hope so…
不琯怎樣，我始終懷疑是否真有黑市借書証這樣一種巨大需求，以使對借書証的過度關注郃理化？
Peaks in the Black Mountains range between 1, 500 m and 2, 700 m above sea level, and fast-flowing rivers have carved out deep gorges in the lower mountain areas.
黑山頂的山脈在海拔1500米到2700米之間，急流在較低的山區沖刷出很深的峽穀。
Theory: utilize the difference of liquor level to form vacuum to completely wash the black liquor out of pulp layer, a three-phase adverse current washing method is adopted.
原理：利用液位差，形成真空度把漿層裡的黑液過濾完進行洗滌，我們是採用三段逆流洗滌的方法。
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