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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When the metals are magnetized, they become so powerful that their ability to repel one another can actually allow them to lift heavy objects off the ground.

当金属被磁化，它们互斥力可以从地面举起重物。

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They had to repel one Italian attack but could not add any more points of their own and their failure to really put the visitors to the sword means Wales look certain to add the 2008 title to their triumph in 2005.

BBC: SPORT | Rugby Union | France 25-13 Italy

The constitutional role of the guard has only one military function, that's to repel invasion.

NPR: Critics Question Using Nat'l Guard Troops at the Border

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