竹干是空心的，所以很轻。（结果）

The stems of bamboo are hollow, which makes them very light.

youdao

我吃惊得叫到。三个月的时间，紫竹花几乎长了一倍，现在都快跟上我插的竹干高了。

I was too shocked to call. In three months time, Zizhu spent nearly twice as long, now quickly catch up with me in the bamboo stem high.

youdao

因为薛涛爱竹，园内随处可见，有些竹子高高耸立，足有50英尺(约合15米)，竹干粗如小树。

Xue loved bamboo - and it's everywhere, some with stalks as wide as small trees towering 50 feet overhead.

youdao