We'll leave some evenings free,that is,if it is all right with you.
如果你们愿意的话,我们想留几个晚上供你们自由支配。
Professor Ronald Bracewell, a leading American radio astronomer,argued in Nature that such a superior civilization, on a visit to our own solar system,
假如有如此高级文明生命访问了我们的太阳系,