Market demand is a stochastic variable which brings difficulty for most profit by ordering right goods.
市场需求量是一个随机变量，它给订货者追求最大利润，确定最优订货量带来了困难。
2
The break-even point is the sales volume at which the profit contribution has just covered the constant costs (variable costs having already been covered).
盈亏平衡点是指利润贡献被固定成本抵消(变动成本已被抵消)的销售量。
3
The ratio which is used to indicate a company's ability to control its variable costs refers to the ratio of operating profit to turnover in a given accounting period. It is expressed as a percentage.