ahead of

在...前面，先于

agrarian, agree, agree about, agree on, agree to, agree with, agreeable, agreeably, agreed, agreement, agricultural, agriculturally, agriculture, agriculturist, agronomist, agronomy, aground, ah, aha, ahead, ahead of schedule, ahead of time, ahem, ahoy, AI, aid, aide, aide-de-camp, aide-memoire, AIDS, ail, aileron, ailing, ailment, aim, aim at, aim for, aimless, aimlessly, aimlessness,