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We change the pitch by tightening the vocal chords to make our voice higher and loosening them to make a lower sound.

我们收紧声带让音调变尖，让我们的声音听上去高亢尖利；放松声带，则使声音低沉。

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Sakanoue said workers could also set the toy on their desks for encouragement as they make a sales pitch by telephone.

坂上表示，上班族也可以将它放在办公桌上，在进行电话营销时得到些许鼓励。

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On Wednesday, Mr. Akerson and other top executives were scheduled to make a pitch in Boston.

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In Philadelphia, it was his turn to make a pitch at the convention of the Pennsylvania AFL-CIO.

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So I want to make a pitch: We want even more Canadians visiting the United States.

WHITEHOUSE: President Obama��s Bilateral Meeting with Prime Minister Harper of Canada | The White House