Discriminating good from bad of PLC system design mainly depend on whether or not reliably tuning in normal condition and reliably protecting in trouble condition.
检验plc系统设计的优劣，主要考察其是否满足：正常条件下可靠运行，故障条件下可靠保护。
People in adversity than in gu condition can strong, more bad luck than good luck when easier to preserve the body and mind.
人在逆境里比在顾境里更能坚强不屈，遭厄运时比交好运时更容易保全身心。
The paper finds that children in higher class have good identification of common weather phenomena, but bad in special weather and slightly different in each weather condition.
研究发现大班幼儿对常见天气现象识别的总体情况比较好，但每种天气的情况略有不同。幼儿对特殊天气识别的总体情况比较差。
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