The tests used in standards for evaluating smoke alarms were developed back in the 1980s. However, despite changes in building materials since then, smoke alarms remain reliable, says Chagger: "They still respond to all the main fires we get today."
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老爸知道自己喊人抬牛的做法危险，他也怕再麻烦亲戚们，说自己记住了教训，以后会将牛犊拴起来。在农村，将一头牛拴住最保险的方式，是用一个铁环硬生生扎过牛的鼻孔，再套上连接槽边木桩的绳索，牛会因为怕疼，不敢摆脱缰绳逃跑。
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