Tetrahydrobiopterin
四氫生物蝶呤
??? 情景例句
So soon? Can't you stay a little longer?
就要走啊？你不能多呆一會兒嗎？
Let me see your pass.
讓我看你的通行證。
His engine failed and he landed on the sea for the second time.
這次他又遭厄運，因引擎故障第二次降落在海面上。