A usually dense,cylindrical,often drooping cluster of unisexual,apetalous flowers found in willows,birches,and oaks.是什么意思_A usually dense,cylindrical,often drooping cluster of unisexual,apetalous flowers found in willows,birches,and oaks.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句