trade, 贸易，交换, swarm, 蜂拥, settlement, 定居点, boast, 拥有；自夸, facility, 设施；设备, childhood, 童年, porridge, 粥, mutter, 嘟囔，低声说, confuse, 使困惑, exact, 确切的, attach, 依恋；赋予意义, contest, 竞赛，比赛, contribute, （给报纸、杂志或书）撰稿, cherish, 珍惜，爱护, awful, 可怕的，糟糕的, exchange, 交换，互换, discover, 发现, enormous, 巨大的，极大的, choice, 选择, difficulty, 困难

Unit 1

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