T he process of biological evolution was very slow at first.
起初，生物进化的过程相当缓慢。
So far, the t cell and its evolution and cancer research has made considerable progress.
到目前为止，有关T细胞的演化以及它与癌症的研究取得了不少进展。
So far, the t cell and its evolution and cancer research has made considerable progress.
到目前为止，有关T细胞的演化以及它与癌症的研究取得了不少进展。
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