It looks like there is an error (content not being displayed) on the page. We will contact your course admin to check on this.
Once your admin addresses this issue and fixes it, then we will update you again.
Charles Sebastian sorry，today I opened it again，It‘s still blank.
Hi WangYiNuo , We have notified the course admin on this and they have yet to rectify this and revert back to us. Once your course admin addresses this issue and fixes it, then we will update you again. Sorry for the inconvenience caused.
Charles Sebastian okay，thank you.
WangYiNuo Sub topic has been completely removed. Please attempt the course again. You should be able to complete the course now.