When you write down your ideas you automatically focus your full attention on them. Few if any of us can write one thought and think another at the same time. Thus a pencil and paper make excellent concentration tools.
当你写下你的想法时，你会自动把全部注意力集中在它们上面。我们中很少有人能同时写出一种思想又能想到另一种思想。因此，铅笔和纸是很好的集中注意力的工具。