dial signal

• 拨号音

dial signal的用法和样例：

例句

1. When you hear the dial tone, dail the number.
   听到拨号音后，就可以拨号码了。
2. The wizard could not detect a dial tone.
   向导无法检测拨号音。
3. Winds did not strengthen appreciably after the Strong Wind Signal came into effect, but due to the storm most places saw a wind direction changing to NE.
   三号信号发出后本地风势并没有明显增强，但风向已逐渐转向东北。

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