Finally you need to add the correct symbol.

最后，你必须添加正确的符号。

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More happily, raising our hand is also the symbol of knowing the correct answer in grade school, or signaling our willingness to volunteer for activities as we get older.

让人轻松点的例子也有：在学校里举手表明知道正确的答案。长大后，举手表示志愿参加某项活动。

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So the symbol timing synchronization may not be exact but must be correct.

因此符号定时不一定要很精确，但一定要特别准确。

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