I had my hair cut off and sold because I couldn't have lived through Christmas without giving you a present.
我把头发剪掉卖了,因为不送你一件礼物,我无法过圣诞节。
I had my hair cut off and sold it because I couldn't have lived through Christmas without giving you a present.
我把头发剪掉卖了,因为我不送你一件礼物,我过不了圣诞节。
I had my hair cut off and sold it because I could not have lived through Christmas without giving you a present.
我把头发剪掉卖了,因为不送你一件礼物我简直过不了圣诞节。
You could use PCR to do that because if you amplify a gene in PCR, that gene had to be present from the beginning.
你可以用PCR技术来鉴定,因为如果你能用PCR扩增某一段基因,说明它从一开始就肯定是存在的
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