常用动词有： 常用名词有：

assume 假定，设想 assumption

suppose 假定，假设 supposition

hypothesize 假设，假说 hypothesis

常用结构有：

It is assumed that … 人们假设…，可以假设…

The assumption is made that … 假定…

If + … 虚拟语气 假如…

Should／ Had／ Were + NP + V… 假如…

Assuming／ Supposing／ Suppose + (that) … 假定…

These data lead us to assume that a totally different mechanism might be …

这些资料促使我们假设，一种完全不同的机制可能是…

It is assumed that petroleum originates in marine deposits．

人们假设，石油起源于海洋的沉积物。

The assumption is made that there is no heat loss from the cylinder．

假定汽缸中没有任何热损失。

Assuming／ Supposing／ Suppose there is no loss of speed over the blades , calculate the out let velocity of the steam．

假定口十片上没有任何速度损失，试计算蒸汽的出口速度。

If the bearings were not lubricated , they would rapidly overheat．

假如轴承未加润滑油的话，轴承很快就过热了。

Had the concrete not been sealed against the air , it would have dried out too quickly.

假如这混凝土未加密封，它可能过早便干掉了。

We can hypothesize any value as truth , but there are varying probabilities for each hypothesis we make .

我们可以假定任何一个值是正确的，但是我们所作的每一个假设都有不同的概率。

Speculation regarding the origin of crude oil has evoked many hypotheses .

对于原油起源的推测已引起许多种假设。

It is mere assumption , resting on no authority whatever and contradicted by all evidence .

它纯属假设，缺乏任何根据，也为一切证据所否定。