I looked at my dad, his knuckles swollen and cracked from farm work and his fingernails tipped with black crescents of motor oil.
我看着我爸爸,他的指关节因农活而肿胀开裂,他的指甲尖被机油染成了一轮黑色的新月。
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Reinhard Strey of the University of Cologne is, however, having another go. He thinks he has cracked the main (and obvious) difficulty—that oil and water do not easily mix.
Wennan oilfield is complex fault-block oilfield with cracked structures, deep oil-bearing formations, high pressure coefficient, low penetrability and much more oil-bearing series.