XV. Put the sentences in the right order according to the information in the text:

1. The goal of molecular manufacturing is to build more machines as well as other products.

2. Most of molecular machines are based on biology.

3. Manufacturing at the nanoscale can be done in several ways.

4. The third way is to use very small machinery.

5. Molecular manufacturing involves the use of tiny molecular machines.

6. Another way to make nanoscale structures is to use large and very delicate machinery.

7. One way is called self-assembly.

14. Unit 2

I. Match English words with their Russian equivalents:

ultimate	отдельный
intricate	подшипник
tool	трехмерный
lever	сворачивать
bearing	сложный
discrete	завершающий
three-dimensional	инструмент
to fold up	рычаг

II. Choose the correct form to fill in the gap

A) Making, starting, getting, desired, painting, well-engineered, manufacturing, used, finished

So the ultimate goal of molecular manufacturing is to build small "dry" mechanical-molecular machines that are intricate and (____) enough to be (____) as a complete set of molecular construction tools. And the (____) point, today's level of technology, is at the level of individual motors and levers and bearings. (____) from "here" to "there" is not a trivial exercise. Fortunately, there are several possible pathways. Furthermore, a small set of molecular construction tools can build a wide range of molecules--this is one of the things that makes molecular (____) workable.

At the level of atoms and molecules, things come in discrete packages. Water and hydrogen peroxide differ by one atom, and there's no molecule that's halfway between the two. (____) a molecule requires that each atom be in the right place--but once a molecule is made, it's completely (____)--there's no (____), sanding, or polishing required. So the goal of molecular manufacturing is to build molecules directly, making exactly what is (____) by transferring molecular fragments onto the object under construction.

B) Adding, build, scanning, make, meet, resulting, manipulate,achieve

This kind of direct atomic manipulation has been done with (____) probe microscopes, but only (on, in, at, by) a few cases, and three-dimensional parts have not (already, yet, just, never) been built. Biology, by the way, does something very similar: it builds one-dimensional molecules by (____) a few atoms at a time onto the end, and the (____) polymer chains then fold up (self-assemble) into three-dimensional structures.

So the question of how to (____) molecular manufacturing boils down to the question of how to (____) nanoscale devices that can (____) and transfer molecular fragments well enough to be worthwhile. There are three increasingly stringent criteria of "worthwhile." First, it has to be better than large devices such as scanning probe microscopes. Second, it has to be good enough to (____) more nanoscale fabrication devices. Third, it has to be good enough to build useful products such as computers, medical devices, or even structural materials. To (____) these criteria requires reliable, programmable, general-purpose mechanical/chemical systems.