the typical vascular cylinder of a dicotyledonous plant or a gymnosperm, consisting of a ring of collateral bundles of xylem, cambium, and phloem. Origin of eustele.
Tap water is fine in Barbados, go in any restaurant and they will ask if you want water then give a choice of bottled or tap. They wouldn't be doing that if the water was bad. It is one of the few places around the world that I will drink tap water. I certainly don't drink it in the UK.
It depends on the location , if you live in beijing , tap water is not support to drink directly. You'd better boiling it . And in some case boiling water is not safe ,so we purchase pure water. But in HeilongJiang and YunNan Province , we dirnk tap water directly.