Then after stooping down and peering carefully through his spectacles, he broke into a laugh.

说着，他弯下腰，透过眼镜，仔细地端详了一会儿，然后哈哈大笑起来。

Betton studied the ironic " Unknown" for an appreciable space of time; then he broke into a laugh.

贝顿研究了具有讽刺意味的“未知”相当长的时间；然后他笑了起来。