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Mr fightout:
How are you!
I have a questio now. It is I don't know the expression "a piece of cake" is 俗语 or 口头禅.  And, can you tell me how can we find out their diffrence.
Thank you.

be a piece of cake: (British, American & Australian, British, very informal)
to be very easy.
e.g ---'How was the test?'
    --- 'A piece of cake!'

Thank you. And here, I have another question. It is how can we say一举两得in English? I think it is said "do one time and get two result". Is it wright? And how can we call 愚人节?

to kill two birds with one stone
April Fool's Day

Thank you very much.