The launch system USES ultrasonic echo and reflection of the time difference to measure the distance test.

该零碎应用发射超声波与反射回波时间差来测量待测间隔。

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After the time of testing comes a time of reflection and then of action.

检验过后便是反思和行动。

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Finally, we come out of full-time education and enter the real world, and this part is a reflection of my professional life, from the first exciting days of work experience to the present.

最后，我们从全日制教育中走出来，进入现实世界，而这一部分也是我从最初令人兴奋的工作经历到现在职业生活的反映。

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City's frustration increased when United doubled their advantage on the stroke of half-time - a cruel reflection of the first-half play.

BBC: Wayne Rooney celebrates putting Man Utd ahead in the derby

The last election in 2005 took three days, and correspondents say the number of meetings this time is being seen as a reflection of the many challenges facing the Church.

BBC: Election for new pope to begin on Tuesday

The last election in 2005 took two days, and correspondents say the number of meetings this time is being seen as a reflection of the many challenges facing the Church.

BBC: Chimney fitted on Sistine Chapel roof for pope election