求翻译：4.上密封密封性能：将淋浴龙头按使用状态安装在测试设备上，打开阀芯，堵住出水口，从进水口引入规定的压力值，在规定的保压时间内，检查龙头各连接处应无渗漏是什么意思？

(4) on the seal sealing performance: shower faucet installed according to the use test equipment, open the valve core, blocking the outlet, introduced from the inlet pressure value within the specified dwell time, check the faucet connections should be no leakage