extraordinary precaution meaning in English

特殊预防措施

Real-time systems often need extraordinary precautions to guard against possible breakdown of the computer .
实时系统往往需要特别小心以防止计算机可能发生故障。
To such an unwonted remoteness , however , had his spirit now withdrawn into itself , that he stirred not in his chair , when old roger chillingworth , without any extraordinary precaution , came into
无论如何，他这种非同寻常的酣睡，已经让他的精神完全收缩到自己的天地，以致当老罗杰灵渥斯并没有特别蹑手蹑脚地走进他的房间时，他居然没有在椅子里惊动一下。