Scientists on Wednesday raised the alert level for Anak Krakatoa and Tangkuban Prahu -- which regularly spew gas and rumble -- from "normal" to "warning," the middle of three alert levels.
上周三,科学家们将喀喀托火山和唐库班
火山的警
度由“正常”
“警告”,三级警
的中间等级,因为这两座火山近来定期喷出火山灰,并发出隆隆的声音。