基本解释成本收益同根派生 income-cost相关词英汉例句So we must change the proportion of the cost and income for the altruistic behavior, and arouse persons' altruistic behavior by improving the income for the altruistic behavior.因此,必須改變利他行爲的成本收益比,提高利他行爲的收益來激發人們的利他行爲。income-cost更多例句