求翻译：食管癌是一种常见的消化系统恶性肿瘤，发病率和死亡率均较高。我国是食管癌的高发区，我国食管癌患者数约占全世界的50%。是什么意思？

Esophageal cancer is a common malignant tumor of the digestive system, morbidity and mortality are high. China is a high incidence of esophageal cancer, the number of patients with esophageal cancer in China accounts for about 50 percent of the world.

Esophageal cancer is a common type of digestive system cancer, the incidence and mortality rates are higher. Our country is the esophageal cancer, my esophagus cancer patients about 50 per cent of the world.

Esophagus cancer is one kind of common digesting system malignant tumor, the disease incidence rate and the mortality rate is high.Our country is esophagus cancer succeeding in the imperial civil service examinations area, our country esophagus cancer patient counts approximately composes the world

Esophageal cancer is a common digestive system cancer, morbidity and mortality rates were high. Is the high incidence of esophageal cancer in China, about a quarter of the world's 50% in patients with esophageal cancer.