Subtracts the specified time or duration from this instance.
从此实例中减去指定的时间或持续时间。
Also, a set of component extraction functions allows one operation, with a readable name, to get one field out of a date, time, or duration. For example, compare.
此外,还有一组名称浅显易懂的分量抽取函数,只要一个操作就能从日期、时间或时期数据中抽取一个字段。
Today we're going to move away from the first dimension of music that we've been looking at, which is duration, or time, and begin to work with the second, which is pitch, and melody.
今天我们要结束对音乐的第一个维度的学习,即时值,或者说拍子,并开始讨论音乐的第二维度,即音高与旋律
We talk in terms of high pitch and low pitch although we'll fine tune that next time, and then we have this idea of duration or time, which we tend to write out in symbols that move from your left to right.
我们是从高低方面来谈论音高,即使我们将于下次讲解曲调的问题,我们已经有了音符时值或时间的概念,我们倾向于用符号来表示,时间是从你的左边向右边移动的
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