慢速英语:Flying Robots Are Coming to US Universities

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1. opportunity n.机会; 适当的时机良机
例句：Please don't let us miss the opportunity.
请让我们不要错过机会。

2. invade vt.侵入，侵略
例句：We'll wipe out any enemy that dare to invade our territory.
敌人胆敢来犯，我们就把它消灭。

3. register vt. 登记，注册
例句：You'd better register this parcel.
你最好挂号邮寄这个包裹。

4. replace vt.代替; 替换
例句：We undertake to replace any product not up to the specifications.
产品不合规格，保证退换。

5. expand vt.扩张; 使…变大
例句：I want to expand the medical program and the recreation program.
我要扩充医药工作和康乐活动。