1、signal

(以手勢、聲音、行動等發出的)信號，暗號

They fired three distress signals.

他們發射了3次求救信號。

As soon as it was dark, Mrs Evans gave the signal.

天一黑，埃文斯夫人就發出了信號。

(用手勢、聲音等)發信號，發暗號，示意

The United manager was to be seen frantically signalling to McClair.

一會兒可以看到曼聯主教練拼命地朝麥克萊爾示意。

He stood up, signalling to the officer that he had finished with his client.

他站起身，向警察示意他和他的當事人已經談完了。

跡象;信號;預示

Kurdish leaders saw the visit as an important signal of support.

庫爾德領導人將這次訪問視作一種表示支持的重要信號。

The first warning signals came in March.

第一次警示出現在3月份。

2、call on

要求;呼吁;號召

One of Kenya's leading churchmen has called on the government to resign.

肯尼亞一位高級宗教人士要求政府下臺。

Frequently he was called upon to resolve conflicts.

不斷有人要求他出面解決沖突。

(短暫)拜訪,探訪，看望

Sofia was intending to call on Miss Kitts.

索菲婭打算去拜訪基茨小姐。