descend from the sky;come (/appear) suddenly ? 現(xiàn)在的口頭語，并非一朝一夕，～的語言； …… (魯迅《且介亭雜文二集》142) Our present vernacular did not descend overnight from the sky.
從天而降cónɡ tiān ér jiànɡ
比喻突如其來地降臨。come from above, descend from the sky, drop out of the sky, drop from the clouds