对不同渗透性的砂层及岩心,均具有较好的封堵效果.It is suitable to the sand beds and cores with various permeabilities.封堵旅客使用的马车路是违法的.It is illegal to block any traveled wagon road.可取式桥塞是一种油田用井下封堵工具.Removable bridge plug is an oil filed down - h...
另两个为胸腺嘧啶和胞嘧啶, 即称为嘧啶的单环结构.The other two, thymine and cytosine, are single ring structures called pyrimidines.胞嘧 啶 核苷:当胞嘧啶通过β - 糖苷键与D- 核糖接合形成的核苷.Cytidine ( cytosine nucleoside ) A NUCLEOSIDE formed when cytosine is linked ...
Brian was whirling like a dervish, slapping at the mosquitoes and moaning.布赖恩如同旋转舞蹈的托钵僧一样转来转去，一边拍打着蚊子一边抱怨不停。He threw himself around the stage like a whirling dervish.他在台上转圈，如同跳旋转舞蹈的托钵僧一样。First of all, you cut costs like ...
商店售货员靠在柜台上漫不经心地招呼我。The shop assistant received me indifferently while leaning on a counter.那两名女售货员正忙着接待顾客。The two saleswomen were busily trying to keep up with the demand.售货员热情地和我打招呼。The salesperson greeted me with a war...