Joan Smith's detective stories are a cut above the rest.琼·史密斯的侦探小说比其他侦探小说都要出色。Joan was rich, beautiful and proud.琼非常有钱, 漂亮且庄重。Joan could not dissimulate.琼不会装假.Joan: We went to a nightclub but the bouncers would not ...
This is a Geiger counter for detecting radioactivity.这是一种盖革计数管,用来测量辐射的.A metal called uranium gave off a kind of radiation, which Marie Curie later called radioactivity.一种叫铀的金属发出一种射线, 后来玛丽·居里把这种现象称为放射性.The site was found...