The annual rings of plants growing in temperate climates can be seen in crosssection as two consecutive rings of light and dark-colored xylem tissue.是什么意思_The annual rings of plants growing in temperate climates can be seen in crosssection as two consecutive rings of light and dark-colored xylem tissue.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句