suppositions造句

We mustn't condemn him on mere suppositions.
我们不可全凭臆测来指责他.

But as with many such suppositions in natural history, no one had ever tested it.
博物学中虽然有许多类似的假设，却从没人对此考证过。

We must make one of two following highly improbable suppositions.
我们不得不采取下列两种不近情理的假说之一.