FireFlies

Perplexity is a free AI-powered answer engine that provides accurate, trusted, and real-time answers to any question.

bdebooks.com offers abundant free eBook resources, supporting search and download of books across literature, education, technology, and more. Get high-quality eBooks without registration, with mobile-friendly reading, making it an ideal choice for students and book lovers. Experience convenient reading now!

专业的在线学习工具平台，提供英语听说读写训练、科学的学习方法和个性化学习体验。现已支持初级到高级的英语学习内容。

Coursera offers online courses, professional certificates, and skill training from top universities and institutions worldwide, helping users learn new knowledge anytime, anywhere, and enhance their career competitiveness. Start your learning journey now!