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。

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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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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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