English to Chinese Medical Medical (general)

ECG recorded (Visits 1, 2, 4, 6, 9 and 13).
At Visit 1, this will be done pre-dose (1 hour) prior to ALKS 9072 injection, and for the rest of the visits, ECG will be done post-dose (3 hours) after the injection.

this will be done pre-dose (1 hour) prior to ALKS 9072 injection这句话如何理解？ post-dose 和pre-dose如何翻译？