(19) On tap:随时可得到的
The director has a wide circle of friends who are on tap when needed.
(20) On the cards :有可能重现的
Unconfirmed news has it that a new university could be on the cards.
(21) On edge:紧张;着急;
When the small boy could not see his mother in the crowd, he was on edge and cried.
(22) On call:待命
The company car is always on call to take the Chief Executive Officer to meetings.
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