You can change the future but you cannot alter your past decisions.

你可以改变未来，却不能对过去的决定做出改变。

youdao

Also, once an index has been created in DB2, you cannot alter any clause of the index definition.

此外，在DB 2中，一旦创建了索引，就不能修改索引定义中的任何子句。

youdao

Note that the size of the boxes for these two templates are fixed - you cannot alter them.

注意这两个模板框的大小是固定的-你没法改的。

youdao