Critical pre-launch tests have been hampered by issues with propellant loading and a malfunctioning helium check valve.

关键的发射前测试因推进剂装载问题和氦止回阀故障而受阻。

Although it would be unusual for rheumatic heart disease to cause ventricular dysrhythmias, we've still got to check your valves.

也许那对风湿性心脏病来说，心室疾病不太常见，但我们还是要检查下你的瓣膜。