名詞 alerting:

1. a state of readiness to respond
   同義詞：alertness
2. a warning serves to make you more alert to danger
   同義詞：alert

動詞 alert:

1. warn or arouse to a sense of danger or call to a state of preparedness
   同義詞：alarm, alert

1. An alert listener will have noticed the error.
   耳朵尖的人能聽出這個錯。
2. In telephony, the use of tones to transmit supervisory, address and alerting signals over a circuit.
   在電話技術中，利用音調(diào)在電路中傳送監(jiān)控、地址和報警信號的做法。