|
| to announce
| a
| to produce or design sth that has not existed before
|
|
| to award
| b
| to become or to make sth greater in amount, number, value, etc.
|
|
| to demonstrate
| c
| to make an official decision to give sth to sb as a payment, prize, etc.
|
|
| to discover
| d
| to need sth; to depend on sb / sth
|
|
| to increase
| e
| to get or accept sth that is sent or given to you
|
|
| to invent
| f
| to be the first person to become aware that a particular place or thing exists
|
|
| to propose
| g
| to tell people sth officially, especially about a decision, plans, etc.
|
|
| to receive
| h
| to suggest a plan, an idea, etc. for people to think about and decide on
|
|
| to repair
| i
| to show sth clearly by giving proof or evidence
|
|
| to require
| j
| to restore sth that is broken, damaged or torn to good condition
|
Exercise 12. Compare these two similar sentences. Which one is true?
| 1. Ali Javan invented the first laser using a pink ruby medium.
| 1. Physicist Mainman invented the first laser using a pink ruby medium.
|
| 2. The first gas laser used helium and neon as the light emitting material.
| 2. The first gas laser used helium as the light emitting material.
|
| 3. The first semiconductor junction laser was demonstrated almost simultaneously by two companies.
| 3. The first semiconductor junction laser was demonstrated by IBM corporation.
|
| 4. Experiments requiring high intensities in narrow spectral regions can be made as well with lasers as with conventional light sources.
| 4. Experiments requiring high intensities in narrow spectral regions can only be made with lasers.
|
