It is a difficult point to teach the students solving the wave equation on finite interval by the reflection law of the wave.

用波的反射原理求解有限区间上的波动方程是数学物理方程中的基本内容，也是教学中的难点内容。

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Methods By using the ultrasound pulse reflection law, the correlation between the process of thrombosis formation and changes in the ultrasonic velocity was studied quantitatively.

方法采用超声脉冲反射法，着重就血栓形成过程中对其声速变化的相关性进行了定量研究。

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It found that people who perceive their car as a reflection of their self-identity are more likely to behave aggressively on the road and break the law.

结果发现，那些认为汽车是他们自我认同的反映的人，在公路上更容易表现的好斗，也更容易触犯法律。

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The Ocala-Marion County lawmaker said the Sanford incident is not a reflection on the law.

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The 10th anniversary of the signing of the ADA is prompting reflection about what the law set out to achieve -- barring discrimination against the disabled -- and how the law has increased awareness and acceptance of those with physical and mental disabilities.

CNN: Is the disabilities act working?

President Karzai, as well as the other candidates, I think have shown that they have the interest of the Afghan people at heart, that this is a reflection of a commitment to rule of law, and an insistence that the Afghan people's will should be done.

WHITEHOUSE: President Obama and Iraqi PM Nuri al-Maliki Address the Press | The White House