Ants store food, repel attackers and use chemical signals to contact one another in case of attack.

蚂蚁储存食物，击退攻击者，并使用化学信号联系彼此以防被攻击。

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In Afghanistan NATO helicopters were called on to help repel an attack by suicide-bombers and gunmen on the Inter-Continental Hotel in Kabul, where many Westerners stay.

驻扎在阿富汗的北约直升机被调去保护喀布尔的洲际酒店，防止“肉弹”和武装人员攻击，这里有大量的西方人员居住。

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It took teamwork to maintain our defensive line and repel Messi and the Barcelona attack.

团队合作使得我们很好的构建了我们的防线，并有效的遏制了梅西和巴萨的攻势。

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Mr. ANDREW MCBRIDE (former Federal Prosecutor): The Commander in Chief does carry with it the authority to repel invasion or attack, and use certain means to do so: one of which could be the use of military tribunals.

NPR: High Court Hears Challenge to Military Tribunals

At least two lawmakers, including the deputy speaker of the lower house, grabbed machine guns and climbed to the roof as they tried to repel the attack.

WSJ: Afghan Insurgents Strike Across Nation

The US and other Nato allies have deployed Patriot missile interceptors to repel any possible attack by missiles or aircraft from Syria.

BBC: John Kerry holds talks on Syria crisis in Ankara