一种约束或限制的影响、感情或力量；约束或束缚。
An influence, feeling, or force that binds or restrains; a bond or tie.
虽然有这样一些规范，但是您实际想使用哪些端口是没有任何限制或约束的。
While these conventions exist, there is no limit or restriction on what ports you use.
约束通过某种方式对列或表进行限制。
A constraint limits either a column or a table in some manner.
限度，限制用来限制包围的东西，如界限或约束。
Something, such as a limit or restriction, that circumscribes.
限度，限制用来限制包围的东西，如界限或约束。
Something, such as a limit or restriction, that circumscribes.
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