VOA慢速英语2012.03.23 example, expression, understand, 英语

Rebecca949

If you ever tried to walk on a fallen tree log, you understand what the expression means. It is easier to fall off the log than to stay on it. 如果你曾试着在平放的原木上行走，你就知道这个成语的意思。从原木上落下当然比呆在上面要容易。__________________________________________________________.

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yjf186

the expression is offen used today.
for example ,you might hear a student say to her friend