“被煮浓”可以翻译为 “be boiled down to a thick consistency” ，“boil down”本身有“煮浓；熬浓”的意思，加上“to a thick consistency”能更清晰地表达出煮到浓稠状态这一含义，使语义更完整准确。
例如：The soup was boiled down to a thick consistency.（这汤被煮浓了 。）