您最多选择25个主题
主题必须以字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
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- Click the button.
- Good job! Now click it again a few times.
- A couple more...
- Nice. The clicker interface works.
- You should see an "Add Item" button - click that.
- Click the "Add Item" button again.
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