I can only do it for you on condition that I'm paid in advance.
只有在提前得到报酬的条件下我才为你做那件事。
The advance behavior must define the certain condition only then has takes the duty.
先行行为必须限定一定的条件才负有作为义务。
The advance behavior must define the certain condition only then has takes the duty.
先行行为必须限定一定的条件才负有作为义务。
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