up to speed

US /ʌp tu spid/

UK /ʌp tu: spi:d/

A1 初級
adj.形容詞了解最新情況
I need to get you up to speed on the latest developments.

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薩爾曼-汗:視頻改變教育 (Salman Khan:Videos change education)

20:59薩爾曼-汗:視頻改變教育 (Salman Khan:Videos change education)