In 1969, the following enterprise by Beijing gage startlight quenching.
1969年，北京量具刃具厂开始采用光亮淬火。
2
You may start to feel better within a week or so after you startlight therapy.
一般在疗法开始的一个星期内你就会感觉好转。
3
When we consider the nightly lifestyle of these bats, we will see they have to be sensitive to the changing light levels because this is how they sense when to start hunting.