事先也告知母亲们此项研究的目的，并取得她们的同意。
Mothers were informed of the study's goals before giving their express consent.
对于能够单独使用的个人信息，我们只会在事先告知并取得您同意的情况下收集；
Regarding Personal Information that can be used independently, we will only collect such information after having notified you and acquired your consent.
这些医生事先已经同意参加这项研究，但是没有被告知演员们出场的时间。
The doctors agreed ahead of time to participate in the study, but weren't told when the actors were going to show up.
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