短語詞組短語on n and off 斷斷續(xù)續(xù)地;有時on shell and off shell 在殼和離殼on again and off again 分分郃郃switch on -and off 開關(guān)通斷on -and off-balance sheet 表內(nèi)和表外項目switch on and off 開關(guān)通斷Handset On and Off 關(guān)機和待機時 返回 on and off