He tests a phone line for a dial tone.

他测试电话线路是否有拨号音.

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When you hear the dial tone, dail the number.

听到拨号音后, 就可以拨号码了.

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I can't get a dial tone.

我 听 不到拨号音.

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The modem could not detect a dial tone. For troubleshooting information, click Help.

调制解调器无法检测到拨号音. 有关疑难解答信息, 请单击“帮助”.

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The phone must be out of order if you can't hear a dial tone.

假如听不到拨号音,电话一定是坏了.

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