acquaintance

n.认识，了解，熟人；相识的人

acidity, acidly, acidosis, acidulated, acidulous, acknowledge, acknowledged, acknowledgement, acknowledgement (also acknowledgment), acknowledging, acknowledgment, acme, acne, acolyte, aconite, acorn, acoustic, acoustically, acoustics, acquaint, acquaintant, acquainted, acquaintence, acquiesce, acquiescence, acquiescent, acquire, acquired, acquisition, acquisitive, acquisitively, acquisitiveness, acquit, acquittal, acre, acreage, acrid, acridity, acrimonious, acrimoniously,