许多国家没有可靠的检验系统，原因是工作人员短缺、基本实验室服务缺失、检验工具包质量低劣，或者其供应不够稳定。
Many countries do not have reliable testing systems because of staff shortages, lack of basic laboratory services, poor quality test kits or their irregular supply.
实践证明，改进后的液压系统工作正常，性能稳定可靠。
The practice showed that the improved hydraulic system worked normally with stable and reliable performance.
实践证明，该系统工作稳定可靠，完全适用于水库的实际应用。
The system works stably and reliably in practice, and it applies to the application of reservoir.
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