One thing Darwin didn't do on the voyage was propound the theory (or even a theory) of evolution.

在远洋考察期间，达尔文有提出进化论（抑或任何理论）。

But if he stepped aside, as gentlemanly conduct arguably required, he would lose credit for a theory that he had independently propounded.

如果他退让一步，就如发扬绅士风度所必须做的那样，他就会失去他自己独立研所得的理论的发现权。

They need small discussion classes that demand the common labors of teacher and students rather than classes in which one person, however learned, propounds his own ideas.

他们需要的是需要老师和学生共同劳动的小型讨论课，而是一个，他有多学识，都能提出自己的观点的课堂。

One idea, which remained in textbooks well into my own school days, was the baked apple theory propounded by the Austrian Eduard Suess just before the turn of the century.

有一种见解直到我上小学时还在教科书里出现过，那就是在世纪之交由奥地利爱德华·休伊斯提出的“云莓干”理论。