（形容大自然的广阔） as boundless as the sea and sky [heavens]; as broad as the sea and sky; in open sea and sky; endlessly vast; The sea is wide and the sky spacious.
（比喻想像或说话无拘束、无边际） discursive; without restriction or limit; straying from the subject; rambling unrestrained and far-ranging; talk at random; indulge in loud and empty talk:
