Before this change happened , the different forms of media were owned by separate media companies 在這種變化發(fā)生之前,不同形式的媒體為不同的獨立的媒體公司所擁有。
The second separation : strain were obstained by continuing cultivation . single colony was cultivated in separate medium by serial dilution method . , better strain with bisser of tran sparent zones will be choosed 二次分離:繼續(xù)培養(yǎng)得到的菌株,同樣用梯度稀釋法在分離培養(yǎng)基中培養(yǎng)菌株單個菌落,觀察其在分離培養(yǎng)基中生長情況。
Naturally , sow milk provided liquid and nutrients , but after weaning , the pig needs to distinguish between thirst and hunger and also to realize that these needs must be satisfied via separate media 自然的,母豬提供了液體奶,并且營養(yǎng)高,但是斷奶后,小豬則需要自己區(qū)分饑餓和口渴,同時要它們自己通過不同的器具滿足饑渴需求。