ahead of time

提前

agree about, agree on, agree to, agree with, agreeable, agreeably, agreed, agreement, agricultural, agriculturally, agriculture, agriculturist, agronomist, agronomy, aground, ah, aha, ahead, ahead of, ahead of schedule, ahem, ahoy, AI, aid, aide, aide-de-camp, aide-memoire, AIDS, ail, aileron, ailing, ailment, aim, aim at, aim for, aimless, aimlessly, aimlessness, ain't, air,