The submission deadline for this Design Challenge is June 21st.
这次挑战赛的提交截止时间是6月21日。
Participants must not discuss the problems with others before the deadline for solution submission.
参赛者在截止日期之前不能和其他人讨论赛题。
Participants must not discuss the problems with others before the deadline for solution submission.
参赛者在截止日期之前不能和其他人讨论赛题。
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