Can bids be canceled/withdrawn during the auction?

No, bids can not be canceled/withdrawn. Loosing bids can be reclaimed after the auction when it´s been announced.

可以在拍卖期间退出吗?

不，出价不能被取消/撤回。拍卖结束后，在拍卖结束后，失败的出价可以取回。

source: xen.network
translation: @xen_artist