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Veins are pretty important.
血管相當的重要。
After all, they carry blood from various parts of the body to the heart.
畢竟，它們從身體的各個部分向心臟運輸血液。
But for all their significance, veins are modest, too.
雖然很重要，但血管也很謙遜。
They are usually content to work behind the scenes, tucked away beneath the skin.
血管甘愿在幕后工作，在皮膚下默默運輸血液。
Sometimes, however, veins take center-stage and become visible as blue lines on the skin, often resembling an unmarked roadmap.
然而，有時候血管成為主角，在皮膚上可以看到藍色的線，很像未被標記的地圖。
If you haven't guessed by now, we're talking about varicose veins.
如果你還沒有猜到，我們討論的正是靜脈曲張的血管。
Have you ever wondered what are they are and how they form?
你是否想知道它們是什么并怎樣形成的？
Basically, a varicose vein is one that is twisted and filled with backed-up blood.
通常，靜脈曲張的血管充滿回流的血液并因此扭曲。
Although they most commonly occur in the legs, varicose veins can also happen in the esophagus, testes and the urinary bladder.
它們不僅多見于腿部，也會表現在食管、睪丸、膀胱上。
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