The action is a leap in the dark.
这是一次冒险行动。
He would not advise everyone to take a leap in the dark.
他不会主张任何人贸然行动。
Having only visited China once before, accepting an invitation to come and practice here on a permanent basis was a bit of a leap in the dark.
以前只访问过中国一次，就接受再次访问的邀请，实现永久互访的原则，还真是有点儿冒险。
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