求翻译：肺活量、用力肺活量正常，用力肺活量第一秒量、第一秒率轻度降低，每分钟最大通气量中度降低，肺弥散量中度降低。是什么意思？

Vital capacity, forced vital capacity normal, forced vital capacity of the first second, first second rate minor reduce, reduce maximum per minute ventilation, Lung diffusion capacity of reducing.