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汉语拼音：cháng liàng

在某一运动过程中，可以看作数值不变的量。如等速运动中的速度。表示常量的数叫常数。常量和常数的区别是前者有量纲，后者无量纲。

• A constant is an identifier (name) for a simple value. As the name suggests, that value cannot change during the execution of the script.

  常量是一个简单值的标识符（名字）。如同其名称所暗示的，在脚本执行期间该值不能改变。

• Otherwise, if the expression is not a constant, another macro function is called to round up the value to a power of two.

  如果表达式不是常量，就调用另一个宏函数把值向上取整到2的幂。

• Is an expression that contains only constant values (it cannot include the names of any columns or other database objects).

  只包含常量值的表达式（它不能包括任何列或其他数据库对象的名称）。

• Almost all memory overhead is done away with, and all allocations can take place in a small amount of (amortized) constant time.

  几乎所有的内存开销都没有了，且所有分配都可以在一个很小的（分摊）常量时间内完成。

• Kill Bad Aliens after we crank up all of the constants. It may not be a good game now, but it's fun to see.

  处理常量之后的KillBadAliens，这样的游戏可能不够好，但却十分有趣，可供参考。

• The emphasis is on play: it's easy to add in planets, zoom in and out, change the physical constants, save and load configurations, etc.

  它的主题在于它的可玩性：可以方便地增加行星，对场景进行缩放，修改物理常量，保存和加载配制，等等。

• If any of these constants had been tweaked at all, the universe would likely be empty, with no stars and no life.

  如果这些常量中的任何一个被扭曲了，这个宇宙很可能是空的，没有星星，也没有生命。

• For example Innodb will count number of IOs done to see how much disk IO system is loaded and compare it to constant.

  例如Innodb会计算IO总量来知道总共有多高的磁盘IO系统负载，并且把它和常量作比较。

• NULL constants cannot be inserted into a timestamp column through a distributed query.

  无法通过分布式查询将NULL常量插入timestamp列中。