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，科学家们将喀拉喀珀拉胡的警戒度由“正常”提高到“警告”，三级警戒的中间等级，因为这两座近来定期喷出灰，并发出隆隆的声音。