yī / shēng / ràng / wǒ / fā / yí / gè / cháng / yīn / guān / chá / shēng / mén / bì / hé / shì / fǒu / zhèng / cháng

医生让我发一个长音，观察声门闭合是否正常。

The doctor asked me to make a long sound to check whether my glottis closes properly.