Changes the pitch but not the length of a sound.
改变音高，而不是长度，一个健全的。
Thee frequency, wave length, and speed of sound are closely related.
声音的频率、波长和速度三者是密切相关的。
After a voyage of five months, they at length arrived safe and sound.
经过五个月的航行，他们终于安全抵达。
After a voyage of five months, they at length arrived safe and sound.
经过五个月的航行，他们终于安全抵达。
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