EU research has now identified 106 potential sites for tidal power, 80% round the coasts of Britain.
欧盟的研究目前已经确定了106个潜在的潮汐发电地点,其中80%位于英国海岸附近。
Unigo,Zinch,CollegeClickTV and Cappex are just some of the sites for college searches on the Web.
VOA: special.2009.02.26
The advantage of this is that now you have four binding sites for antigen instead of just two.
这样的好处是一个抗体上,有四个抗原结合位点而不仅仅是两个
They also have binding sites for antigen, but they are sort of two IgG type molecules bound together by another peptide chain.
同样IgA抗体表面也有与抗原结合位点,但它们就像两个IgG型分子,通过肽链相互连接
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