Voyages through space were unthought - of till Recent times.
不久以前,说到太空旅游是不可思议的.
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Voyages through space are unthought - of to us.
我们根本没想过可以太空旅行.
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However, manners have had to adapt to a number of situations hitherto unthought of.
但是, 礼节需要适应许多以前从未想到过的情形.
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"an unhoped-for piece of luck"
"an unthought advantage"
"an unthought-of place to find the key"