Using samples from around Southeast Asia, Buckley and his colleagues saw this pattern in tree rings from recent years, when he could corroborate the rings with other historical climate information.

VOA: standard.2010.04.05

You have a single beam coming in, and you end up with rings.

单个光束进来，以光圈的形式出去。

麻省理工公开课 - 固态化学导论课程节选

You have a single beam coming in, and you end up with rings.

单个光束进来，以光圈的形式出去。

麻省理工公开课 - 固态化学导论课程节选