English translation of '假定'

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1. suppose
   ⇒ 假定你中了大奖,你会做什么？ (Jiǎdìng nǐ zhòngle dàjiǎng, nǐ huì zuò shénme?) Supposing you won the jackpot, what would you do with it?
   ⇒ 有外星人的说法只是一种假定。 (Yǒu wàixīngrén de shuōfǎ zhǐshì yī zhǒng jiǎdìng.) The existence of extraterrestrials is just hypothesis.