在昨日白宫举行的记者会上，奥巴马表示：“这是一场已持续一段时间的缓慢发酵的危机，不是什么新情况。”
"This is a slow-rolling crisis that has been going on for some time. This is not new, " he said at a White House press conference yesterday.
采用已耐氧驯化的两歧双歧杆菌与普通乳酸菌共同发酵胡萝卜汁制得发酵饮料。
The fermented beverage was prepared through the fermentation of carrot juice by cooperation of common lactic acid bacteria and the oxygen-tolerant strain of bifidobacterium.
发酵液体饲料在欧洲已广泛使用，并成为当前人们研究的新热点。
The fermented liquid feed has been used widely in Europe, and there is an increasing interest on this subject.
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