Researchers place a big block of tar into the machine.

VOA: special.2010.04.07

Yeah. So I spent two years in Israel studying in the place called Gush at Etsyon the Etsyon Block which is about 20 km south of Jerusalem.

对，所以说我在以色列待了两年,在Etsyon的Gush学习,在距耶路撒冷以南20公里的Etsyon地区。

普林斯顿公开课 - 人性课程节选

Yeah. So I spent two years in Israel studying in the place called Gush at Etsyon the Etsyon Block which is about 20 km south of Jerusalem.

对，所以说我在以色列待了两年,在Etsyon的Gush学习,在距耶路撒冷以南20公里的Etsyon地区。

普林斯顿公开课 - 人性课程节选