the thin part at the base of a leaf that supports it and joins it to the stem of a plant 叶柄:叶片底部的薄部分,支撑并连接到植物的茎上 The disease may cause small black spots on leaves, petioles and stems of new shoots. 这种疾病可能会在新芽的叶子、叶柄和茎上造成小黑点。
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