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He said, "We continue to expect economic activity to bottom out, then to turn up later this year."

VOA: special.2009.05.08

I'm going to begin at the bottom of 73: If you have your book, go ahead and open it up.

我将从73页最下面开始读：,如果你带了书，那么就打开书翻到那页。

耶鲁公开课 - 1945年后的美国小说课程节选

So, if we're talking about five different orbitals and we're talking about a ground state atom, we know that we just need to start at the bottom and work our way out up.

因此，如果我们要讨论的是,五个不同的轨道且是属于一个基态原子的话，我们知道，我们只需要从最低的轨道,开始一个一个往上找。

麻省理工公开课 - 化学原理课程节选

The most common batteries are made up of negative and positive halves (the anode and the cathode), a material to separate them, and "current collector" layers at top and bottom to gather up the electric charges moving through.

BBC: 'Paint-on' batteries demonstrated

As the program developed, modules were continuously adjusted and the approach to implementing projects had to be modified to a bottom-up approach from top-to-bottom previously.

WSJ: Microloans Target Shopkeepers

Communities and local civil society organizations need to be actively involved in decision-making in order to generate bottom up demand for change and hold governments to account for public investment in water and sanitation.

FORBES: CEO of WaterAid America David Winder Calls For More Public Education On Water Issues