49. acknowledge v.承认,致谢★50. acquaintance n.认识,了解,熟人51. acquire vt.取得,获得,学到★52. acquire vt.取得,获得,学到53. acre n.英亩(=6.07亩)54. across prep.横过,在…对面55. act vi.行动,见效 n.行为
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