472 the machine runs perfectly well , it had been operating with a continuous run of 72 hours.
472 the machine runs perfectly well , it had been operating with a continuous run of 72 hours.
这强机器运转很好，它至今已连续运转了七十二小时。
472 the machine runs perfectly well , it had been operating with a continuous run of 72 hours.
这强机器运转很好，它至今已连续运转了七十二小时。