还有一个最大的优势是便于管理员的管理与维护，既省时又省力。
Another advantage is the largest administrator facilitate the management and maintenance, saving you time.
第三，从订货、买货到货物上门无需亲临现场，既省时又省力；
Thirdly, from order door-to-door without buying the goods in person at the scene, is both time and effort;
经过理论计算和相关的试验，认为此种方法相对实验研究来说，既具有快速及准确性，又具有省时、省力、费用低等优点。
The theoretic computation and related experiments proved that such method is more rapid and accurate by comparison with an experiment research, while with lower timeconsumption and cost.
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