So one can specify it by four numbers or coordinates.

所以可以用四个数字或坐标来指定它。

On the web, this is specified by a Uniform Resource Locator, or URL for short.

在 Web 上，这是由统一资源定位器或简称 URL 指定的。

OK, to start, the conditions are specified by the buyer and may include Insurance Forms, Way Bills, Bills of Lading, Customs forms, various certificates.

好的，首先，所有的条件都是由买方指定的，并且可以包括保险单、 货运单、提单、报关单以及各种证书。

They told the negroes that if they would go back, they would go as free workers, protected by written contracts specifying wages by the day.

他们告诉那些黑人，如果回去，可以算自由工人，受书面合同的保护，按天计算工资，这些老黑人高高兴兴地回到农场，给那些如今已贫穷不堪的农场主加重了负担，但后者又不忍心赶他们出去。

The shapes of proteins, and hence their remarkable functions, are completely specified by the sequence of amino acids in the protein chain.

蛋白质的形状及其显着功能完全由蛋白质链中的氨基酸序列决定。