To keep store-bought flowers fresh, snip an inch off each stem, add two teaspoons of vodka and one teaspoon sugar.

为了保持商店里买的鲜花新鲜，把每根花茎剪掉一英寸，然后加两勺伏特加和一勺糖。

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In fact, the scientists had mapped only a certain portion of the epigenomes of two cell types (an embryonic stem cell and another basic cell called a fibroblast).

事实上，科学家仅仅绘制了两种细胞外基因的某一部分而已。

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Now with stem cell technology there are two pathways that are imaginable.

如今有了干细胞技术，也就有了两条途径可选。

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(SAYING...) Nearly two-thirds of those polled said women and minorities in STEM careers were under-represented in their companies or institutions.

VOA: standard.2010.03.26

Even saying that two-dozen of them are embryonic stem cells seems overly optimistic to some scientists in the field.

FORBES: Stem-Cell Numbers Game

The problem I see with American healthcare are two-fold, and both do indeed stem from government involvement.

FORBES: Why America Needs To Be An Innovation Nation

The company and the foundation share the same two philanthropic priorities: environmental causes and so-called STEM education, for science, technology, engineering and manufacturing.

FORBES: American Companies That Give Back The Most, 2012