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Previously on phrasal Verb[bail out]] 援助

本週片語[mug up on] to study something very hard, usually for a short period of time and often in preparation for an exam.

Ex.

I’m mugging up on economics –the exam;s tomorrow.

Sam’s sure that there will be a wuestion on World War 2 in the history exam – he’s mugging on it now.
臨時抱佛腳
Reference: Phrasal Verbs. Betty Kirkpatrick MA