花费了整整十个星期，每天九个小时，他用黑色毡尖笔小心翼翼地写下了他的留言。
For ten weeks, nine hours at a stretch, he carefully wrote his message with a black felt-tip marker.
可以很容易地用一般圆珠笔，铅笔，或毡尖在这条白色标记带上做标记。
It's easy to write on this white strip using an ordinary ballpoint pen, pencil, or felt-tip marker.
可以很容易地用一般圆珠笔，铅笔，或毡尖在这条白色标记带上做标记。
It's easy to write on this white strip using an ordinary ballpoint pen, pencil, or felt-tip marker.
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