Vacancies are up in much of the richworld,as companies seek staff while workers still anxious about infection remain on the sidelines.许多发达国家的职位空缺都在增加,因为公司在寻找员工,而仍担心感染风险的员工仍在观望。麻烦分析下这个句子,不应该是while workers are still anxious about...吗 are怎么不见了