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1·He promoted his own welfare at the expense of others.

他不惜以他人利益为代价换取自己的利益。

2·An entity, such as a baboon, is said to be altruistic if it behaves in such a way as to increase another such entity's welfare at the expense of its own.

如果一个实体，例如狒狒，其行为的结果是牺牲自己的利益，从而增进了另一同类实体的利益，该实体就被认为是利他性的。

3·An entity, such as a baboon, is said to be altruistic if it behaves in such a way as to increase another such entity s welfare at the expense of its own.

如果一个实体，例如狒狒，其行为的结果是牺牲自己的利益，从而增进了另一同类实体的利益，该实体就被认为是利他性的。

4·The calculating method of the material cost, the salary and welfare, the power expense, the depreciation and so on;

产品成本计算方法的选择、产品成本计算的品种法、产品成本计算得分批法、产品成本计算的分步法。