If you whistle in a slowly increasing tone, your individual notes will deviate in small-enough amounts from the acceptable threshold to produce recognized tonal events.

如果以缓慢升高的音调吹口哨，则您个人的音调与生成可识别的音调事件的可接受阈值之间会有极小的偏差。

youdao

Try your double low-tone whistle with the same temporal spacing and the same notes, and you will see the text "two low" printed to the screen. If you want to see the functioning of the cmdWhistle.pl

尝试以同样的时间间隔并以相同的音调吹两声低音调口哨，您将看到文本 “two low” 打印到屏幕上。

youdao

Every whistle has a "sweet spot" where the shape is correct for a long, clear tone. Practice with the above whistles until you find your sweet spot.

每个哨音都有一个“绝妙点”，即能够发出悠长、清晰音调的口型。一个音、一个音地练习，找到每个音的最佳点。

youdao

This could include training policies, whistle-blower programs, internal tone-from-the-top communications and so forth.

FORBES: The World's Most Ethical Companies