https://sproutingstem.org/en/sproutingclassroom/subject/lesson/?subject_id=H9brvTfx3XtXyvVwlRrC&lesson_id=o2tY9FxLr80fJ9WscKXc#top
Different ions.
• Student at St. Paul's Co-educational College (HKDSE Curriculum) • Joined since 2020