| 1. | Above a certain temperature, the enzyme molecule will become unfolded .
超过一定温度，酶分子将会展开。 |
| 2. | Crystalline substances, such as ice, or a metal, melt at a definite temperature .
象冰或金属等结晶物质，则是在一定温度下才发生溶解。 |
| 3. | Air is said to be saturated with water vapor when it contains the maximum amount that will evaporate at a given temperature .
当空气中所含水分在一定温度下处在最大蒸发量时，就说空气中的水分饱和了。 |
| 4. | Metals do not melt until heated to a definite temperature
金属要加热到一定温度才会熔化。 |
| 5. | The machine shuts off automatically if a certain temperature is reached
这机器在达到一定温度会自动关掉。 |
| 6. | The metal is cooled in the air , having been heated to a definite temperature in the furnace
金属在炉子里加热到一定温度后放在空气中冷却。 |
| 7. | It is their plasticity at certain temperatures which gives plastics their main advantage over many other materials
正是在一定温度下的塑性使塑料优于许多其他材料。 |
| 8. | It is their plasticity at certain temperatures that gives plastics their main advantage over many other materials
正是在一定温度下塑料所具有的塑性使它比其他许多材料更优越。 |
| 9. | Therefore the purification reaches to one hundred thousand grades . through steam heat exchanger , the temperature of air is raised to certain temperature
达到十万级净化，经蒸汽热交换器，使空气升温至一定温度。 |
| 10. | There are three crystalline phases for tio2 , including rutile . anatase and brookite . transformation of crystalline phase occurs at a certain temperature and pressure
Tio _ 2具有金红石、锐钛矿和板钛矿三种晶体结构，在一定温度和压力下可发生晶体结构的转变。 |
