江山易改，本性难移：揭秘人类行为的不变法则

1. 需要之时方知友。 2. 患难见真情。 3. Actions speak louder than words. 4. A friend without faults will never be found. 5. 知音难觅。 6. Adversity leads to prosperity. 7. A fox may grow gray, but never good. 8. A

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