Keep water away from vent stacks and safety relief devices that can be plugged with frozen water.

水要远离通风管道和安全减压装置，因为它们会被冻结的水堵塞。

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Now on my way to and back from school, I always have earphones plugged to my ears, and inside I'd have all my favourite songs, and when I hum along to the tunes the frustration would slowly fade away.

现在上学放学的路上，耳上总会挂着耳机，里面总会放着我欣赏的歌，嘴里轻轻哼着，无聊和乏味也就跑远了。

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But Wigan plugged away as the fog closed in and got the goal their effort deserved.

BBC: SPORT | Football | Premiership | Wigan 1-0 Portsmouth

Scotland plugged away in a tense last few minutes looking for a final score as Argentina were forced to hang on after looking so comfortable for much of a low-quality affair.

CNN: Argentina clinch final semi place

Her campaign wrote off smaller, outlier states, such as Kansas, Idaho, Nebraska, Wyoming, where Mr Obama plugged away to add to the delegate tally he amassed in places like Illinois, Virginia and Wisconsin.

ECONOMIST: Hillary Clinton sacks her strategist, Mark Penn