井底温度是注水泥工艺中的重要参数。

Temperature is an important factor in cementing technology.

井底附近地层渗透率降低比改善对调查半径的影响要大。

If skin factor of formation damage is more, its radius of investigation is less.

斧头斩首并被扔到井底，贞子在成为不死身之前还活了33天。

Beaten over the head with an axe and dumped into the bottom of a well, Sadako survives for 33 days before inventing her means to everlasting unlife.

很多个漆黑的夜晚，一想到从井底可以看到天空布满星星，我就感到很安慰。

On many a dark night the vision of that round slip of sky with stars has comforted me.

他们的作业工具是：挖土用的手工泥铲、浇筑混凝土井壁用的胶合板模板、还有手工制作摇杆。 摇杆将一个人送到井底，那个人就在井底一点点挖土然后再通过摇杆把沙子一桶桶送到地面。

They worked with hand trowels, a plywood form for lining the shaft with concrete, inch by inch, and a sturdy hand-built crank for lowering a man to the bottom and sending up buckets of sand.