A stem is a part of a plant. 茎是植物的一部分。

　　It helps to hold up the flower. 它帮着支撑花朵。

　　It also moves water from roots to leaves. 它也能把根部的水运输到叶子那里。

　　What is the tallest tree with the tallest stem in the world. 世界上有着最长树干的最高的树是什么？

　　The tallest tree is in the USA. 这棵最高的树在美国。

　　It is 367 feet, 6 inches. 它高约367英尺零6英寸。

　　It is over one thousand years old. 它有1000多岁了。

　　It is much higher than the Statue of Liberty.  它比自由女神像高得多。