第一步
本課次尚無繁體中文譯文，以下內容為英文原文。
This is a short sample course. It shows what a flat course looks like: two lessons and no groups.
Read this lesson, mark it as read, and move on to the next one.
目前瀏覽器無法儲存進度，閱讀紀錄不會在下次造訪時保留。所有頁面仍可正常使用。
This is a short sample course. It shows what a flat course looks like: two lessons and no groups.
Read this lesson, mark it as read, and move on to the next one.