词典释义：
双语例句
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Profuse brown necrotic speckling of leaflets usually close to, or just within marginal areas which are initially green but later develop narrow brown scorched rims and then shrivel.
缺钾的苜蓿叶片：大量褐色坏死斑点经常在叶尖边缘附近或叶缘上，最初是绿色但不久就扩展成狭小的褐色烧焦状边缘，直至枯萎。