留意你杯子的尺寸：使用大些的玻璃杯会很容易超出安全限度的。
Watch your glass size: it's easy to exceed safe limits by using a bigger glass.
活塞由于燃气而发热，假如要使金属的温度保持在安全限度以内就必须散热。
The piston absorbs heat form the gas, and this heat must be carried away it the metal temperature is to be held within safe limits.
但这是建立在预算责任办公室的主要预测基础之上的，而奥斯本则想达到GDP1 %的安全限度内。
But that is based on a central projection from the OBR and Mr Osborne may want to build in a safety margin of up to 1% of GDP.
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