Suppose someone gave you a pen - a sealed, solid-colored pen.假如有人送你一支笔，一支不可拆卸的单色钢笔。You couldn&#39t see how much ink it had.看不出里面究竟有多少墨水。It might run dry after the first few tentative words或许在你试探性地写上几个字后它就会枯干，or last just long enough to create a masterpiece(or several) that would last forever and mak