costless

costless的音标是[ˈkɒstləs]，基本翻译是“无代价的；无偿的”。速记技巧是利用字母组合等巧记单词拼写。

Costless这个词的英文词源可以追溯到拉丁语“costere”或“costatus”，意为“无成本的”或“免费的”。它的变化形式包括比较级“costless”和最高级“most costless”。

相关单词：

“Inexpensiveness”是costless的一个近义词，意为“不昂贵”，可以用来描述物品或服务的价格低廉。

“Free”是costless的一个常用词，表示无需支付任何费用或代价。

“Non-costly”也是一个与costless相关的词，表示没有成本的，不涉及金钱或资源的消耗。

在英语中，有很多与costless相关的单词，例如“Cost-free advertising”表示免费的广告，“Cost-effective”表示成本效益高的，“Cost-saving measures”表示节省成本的措施等。这些单词都与成本或费用无关，而是强调无成本或低成本的特点。

总的来说，costless这个词及其变化形式和相关单词在英语中广泛使用，用于描述无需支付任何费用或代价的情况，强调经济上的优势和节约成本的重要性。

常用短语：

1. costless goods 无需付费的商品

2. costless money 无代价的钱

3. costless time 无代价的时间

4. costless effort 无代价的努力

5. costless success 无代价的成功

6. costless knowledge 无代价的知识

7. costless learning 无代价的学习

双语句子：

1. 无需付费的商品，我愿意购买。

2. 花费时间学习，收获知识。

3. 无需代价的努力，值得尝试。

4. 成功无需代价，但需要努力。

5. 知识是无价的，但可以通过学习获得。

6. 免费的学习资源，值得利用。

7. 无需金钱的努力，值得推广。

英文小作文：

标题：The Benefits of Free Learning Resources

Free learning resources are becoming increasingly popular in today"s digital age. These resources provide access to a wide range of information and knowledge, often without the need for payment or subscription. By utilizing these resources, individuals can save time and money while gaining valuable knowledge and skills. Additionally, free resources are often updated regularly, ensuring that users are always up-to-date with the latest trends and developments in their field.

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In conclusion, free learning resources offer a myriad of benefits, including time and money saving, access to up-to-date information, social awareness promotion, and personal growth and development. Therefore, it is recommended that individuals make full use of these resources to enhance their knowledge and skills, while contributing to a more inclusive and sustainable society.