起音、保持、释放Attack, hold, release
写了两个音符，一定要弹两次吗？先预测，再沿着时间线核对。Do two written notes always mean two attacks? Predict, then check along the timeline.
原创单声部4/4例题。方格是简化时间图，不是五线谱；C4是中央C。弧线只表示同音高的延音线，不是圆滑线。Original one-voice examples in 4/4. These boxes form a simplified time diagram, not staff notation; C4 is middle C. Arcs mean same-pitch ties, not slurs.
先数起音，不只数方格Count attacks, not just boxes
每个方格是一个书面片段；宽度表示时值。延音续接处标有“延”，休止标有文字。数字t从0开始，以四分音符时值q计。窄屏可在图内横向滚动；下方文字包含同样的信息。Each box is a written segment; its width represents duration. Tied continuations and rests are labeled. Time t starts at 0 and uses quarter-note units q. On narrow screens, scroll within the diagram; the text below gives the same information.
这些词是什么意思？What do these words mean?
- 起音是一个开始时点。保持是书面时值继续，不表示钢琴音量恒定；声音可能自然衰减。An attack is a starting instant. A hold means written duration continues, not that a piano's volume remains constant; sound may decay.
- 释放是音事件的结束时点。休止是一个时间区间；释放后也可以立即起新音，没有休止。A release is an event's ending instant. A rest is an interval; a release may instead be followed immediately by a new attack, with no rest.
- 延音线续接处不重新起音。小节线本身不要求释放。同一时点释放与起音仅规定书面时序，不规定手指动作。A tied continuation is not reattacked. A barline does not itself require release. Simultaneous release and attack specify written timing, not finger technique.
本图无声音、无自动播放、无录音或分数。无踏板。书面释放不保证真实余音立即停止；本图不验证身体动作、实际演奏或学习效果。完整课文包含纸笔答案。No sound, autoplay, recording or score. No pedal. Written release does not guarantee immediate silence on an acoustic piano. This diagram does not validate movement, performance or learning effectiveness. The full lesson includes paper answers.