Exactly. To add vectors geometrically you just put the head of the first vector and the tail of the second vector in the same place And then, it's head to tail addition Any other questions?

是的，几何上两个向量相加,你就把一个向量的尾巴,放到另一个向量的头上去,那就是“头尾”加法,还有问题么？

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The operation of finding the sum of two vectors is called vector addition .

求两个向量和的运算，叫做向量的加法。

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The review summarized the current studies of gene transfer to corneal endothelium and vectors that are been using. In addition, the review indicates the study prospect for future vectors.

对角膜内皮基因转移技术和载体的研究现状，及未来载体的研究方向进行综述。

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