講解：
Attention, please!
注意:
Attention, please! Passengers for flight KL412 are requested to go to gate 21 immediately.
請注意！請 KL412 航班的乘客立即到 21 號門登機。

acknowledge sb / sth (as sth)
承認(權威、地位)
The country acknowledged his claim to the throne.
這個國家承認了他繼承王位的權利。

introduce A (to B) | ~ A and B | ~ yourself (to sb)
把…介紹(給)；引見；(自我)介紹:
He introduced me to a Greek girl at the party.
他在聚會上介紹我認識了一位希臘姑娘。

token + sth
裝樣子的；裝點門面的；敷衍的:
The government has only made a token gesture towards helping the unemployed.
政府只不過是做做樣子表示了一下對失業者的幫助。

a top priority
優先事項；最重要的事；首要事情:
Education is a top priority.
教育是當務之急。