基于特征不变量的方法，实现速度比较快，但都只适用于某一类图像。

The Feature invariant approaches can detect the human faces fast, but only some kind of face can be detected.

youdao

先后提出过不少方案，在1929年、1945年和1954年都曾取得一些进展，但都只停留在数学表达形式上，没有得到有物理意义的结果。

Though he made some progresses in 1929, 1945 and 1954, all results are limited in the physics meaning of the mathematics expression_r_r_r.

youdao

我只和我的第一个祖母祈祷过，但那是很久以前的事了，我都忘了。

I only prayed with my first grandmother, but it is so long ago, that I have forgotten.

youdao

And immediately, it composed of all the very same pieces that made up my watch.

但其实，这只手表的所有零件都是,原来的。

耶鲁公开课 - 死亡课程节选

We'll think about it in section, how you don't need to vaccinate everybody, but you just need to vaccinate a critical number in order to stop the disease from progressing through a community.

我们在讨论会上讲这个,为什么不需要给每个人都接种,但你只需要让接种人数达到一个临界值,就能阻止这个疾病在社会中传播

耶鲁公开课 - 生物医学工程探索课程节选