vaca
abbr.
vacuolating cytotoxin A 空泡细胞毒素A（见于幽门螺杆菌）;
例句:
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The find is located in the Vaca Muerta basin of Argentina's Neuquen province.
来自BBC
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Vaca Muerta also has an estimated 4.5 trillion cubic feet of natural gas, according to Spain's Repsol-YPF energy company.
来自NPR