笨方法学英语！

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。

One tool that does it all. Search, generate, analyze, and chat—right inside Notion.

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

Get instant, step-by-step solutions for all subjects with StudyX AI homework helper. Available 24/7 with accurate answers, AI tutoring, and community support.