adj.不须花钱的，无须付出代价的

The library offers costless access to a wealth of knowledge for all members of the community.
图书馆为社区所有成员免费提供了丰富的知识资源。
Costless marketing strategies like social media engagement can significantly boost a small business's online presence.
像社交媒体互动这样免费的营销策略能显著提升小企业的在线知名度。
The app provides costless language learning resources, making education accessible to people around the world.
这款应用提供了免费的语言学习资源，使世界各地的人们都能接触到教育。
The museum's costless admission policy encourages families to visit and learn together.
博物馆的免门票政策鼓励家庭共同参观和学习。
By adopting costless energy-saving measures, homeowners can reduce their utility bills without any investment.
通过采取无需成本的节能措施，房主可以在不投资的情况下减少公用事业费用。
The online platform offers costless courses on various subjects, enabling continuous learning for everyone.
在线平台提供各种科目的免费课程，使每个人都能持续学习。
The city's costless concert series in the park brings communities together for enjoyable evenings.
城市在公园举办的免费音乐会系列将社区聚集在一起，共度愉快夜晚。
Costless software updates ensure that users always have the latest features without additional expense.
免费的软件更新确保用户总能获得最新功能，无需额外费用。
The charity runs a costless meal program for the homeless, providing them with essential nutrition.
慈善机构为无家可归者运行了一个免费餐饮项目，为他们提供必要的营养。
With the abundance of costless online tutorials, anyone can learn a new skill from the comfort of their home.
有了大量免费的在线教程，任何人都可以在家中舒适地学习新技能。