Nowadays, farms raise chicken in an all - in - one process, so all the henhouses are very clean.现在农场都是全自动一体化养鸡, 所以鸡舍里面很干净.The state farms were semi-military in character.那些国有农场从性质上讲是半军事的。Each family farms individually an...
Bacteriophage ( phage ) A virus that infects bacteria.噬菌体 :感染细菌的病毒....a simian virus.一种猴病毒the ability of the virus to mutate into new forms病毒变异成新菌株的能力human immunodeficiency virus or HIV人体免疫缺陷病毒，即HIVObjective : To establi...
Speakers can use intonation, stress, and pauses to help make their meaning clear.讲话的人可以用语调 、 重音和停顿等方法来帮助他们表达的更明确.He pauses a moment at the foot of a tree to take his bearings.他在一棵树下面停了下来,以便判明自己的方位.Between the pauses of t...