costar

costar的音标是[kəʊˈstɑː(r)]，基本翻译是“合作者，配对”，速记技巧是“cost（成本）+star（明星）=成本明星=合作者，配对”。

Costar 的英文词源是 costare，意为“做伴，陪伴”。它的变化形式包括过去式 costared 和现在分词 costarring。相关单词包括 partner（伙伴）、co-worker（同事）、co-star（共同主演）、co-sponsor（共同发起人）、co-ordinator（协调员）、co-existence（共存）、co-operation（合作）、co-ordination（协调）、co-pilot（副驾驶）和costar（与…同等）。这些单词都与 costar 有着相似的含义，表示陪伴、合作、共同存在等概念。它们在英语中广泛使用，表达各种社交和职业情境。

常用短语：

1. cross-costing

2. cost-effective

3. cost-benefit analysis

4. fixed cost

5. variable cost

6. marginal cost

7. unit cost

双语例句：

1. We need to cross-cost the resources to ensure the most efficient use of our budget. (我们需要交叉核算资源以确保最有效地利用我们的预算。)

2. The new product has a cost-effective price that will appeal to a wide range of customers. (新产品的价格具有成本效益，会吸引广泛的顾客。)

3. The cost-benefit analysis of investing in new technology should take into account both the short-term and long-term benefits. (投资新技术的成本效益分析应该考虑到短期和长期利益。)

4. Fixed costs are those that remain unchanged regardless of production levels, while variable costs vary according to production levels. (固定成本是在不考虑生产水平的情况下保持不变的成本，而可变成本则随着生产水平的不同而变化。)

5. The marginal cost of producing additional units should be carefully considered to ensure that the business remains profitable. (生产额外单位的边际成本应仔细考虑，以确保企业保持盈利。)

6. The unit cost of each product should be carefully calculated to ensure that the business is not overpaying for its goods and services. (每个产品的单位成本应仔细计算，以确保企业不会为其商品和服务付出过高代价。)

英文小作文：

When it comes to cost management, we need to consider various costs, including fixed costs, variable costs, and marginal costs. Fixed costs are those that remain unchanged regardless of production levels, while variable costs vary according to production levels and are affected by factors such as raw material prices and labor costs. Marginal costs refer to the costs incurred when producing additional units, and it is important to carefully consider these costs to ensure that the business remains profitable.

In addition to considering costs, we also need to take into account cost-effective measures that can help us reduce costs and increase profits. For example, we can optimize production processes to reduce wastes and improve efficiency, adopt efficient production methods and equipment, and reduce unnecessary expenses. By doing so, we can improve our cost competitiveness and gain a competitive advantage in the market.