You cannot afford to relax your concentration for a moment.
你必须集中精力，一刻都不能松懈。
You cannot verify any of these constraints in pure RELAX NG code, either.
用纯粹的RELAX NG代码也不能验证这些约束。
You cannot afford to relax your vigilance for a moment.
游完泳后你愿意放松一下吗？
You cannot afford to relax your vigilance for a moment.
游完泳后你愿意放松一下吗？
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