it has been shown that中文什么意思

has been: 已經(jīng); 曾經(jīng)紅過一陣; 曾經(jīng)盛極一時
has-been: n. 〔口語〕曾經(jīng)時興的東西；會風(fēng)流一時的人物。 It is better to be a has-been than a never-was. 〔諺語〕寧可曇花一現(xiàn)，不能默默無聞。 adj. 〔美口〕過時的，從前的。
there has been: 出現(xiàn)了
there is and has been: 現(xiàn)時和一直以來均
although it has been before: 盡管以前人們用過這個理由

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nevertheless, it has been shown that side-chain planarity is important in conferring high adenyl cytokinin activity .
然而已經(jīng)證明，對于高的腺苷細(xì)胞激動素活性，側(cè)鏈的平面性很重要。
recently, it has been shown that such substances, either by themselves or by virtue of their impurities or reaction products, are teratogens .
最近已經(jīng)證明，這類物質(zhì)，或是它們本身，或是它們的不純物或反應(yīng)產(chǎn)物，都是致畸形物。
it has been shown that there are more than 100 variants of the growth hormone molecule
研究表明有超過100多種的生長激素分子。
it has been shown that the her2 receptor is oer-expressed in prostate cancer cells
已經(jīng)證實在前列腺癌細(xì)胞中her2受體是過度表達(dá)的。
it has been shown that at the heart of various quantum coherence effects lies cpt
業(yè)已表明，在各類量子相干效應(yīng)中，相干捕獲是一種基礎(chǔ)的效應(yīng)。

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