Paste an excerpt or drop a PDF. You get the first excerpts as bilingual side-by-side text, exactly like the app. 粘贴文本或拖入 PDF，前两段免费翻译，中英对照。PDF 在你的浏览器里解析，不会被上传。
In the app: the whole document is split into short excerpts on a daily plan, academic terms are tap-to-define, every finished excerpt gets a summary, and you can ask questions answered only from your own readings — with citations.