difficulty的單復數使用情況? 查字典寫表困難困境時可數，艱難辛苦費勁時不可數。。。有點弄

difficulty （可數） 困難，困境 [ 復數difficulties ] 例： A difficulty has cropped up at work. 工作中突然出現困難。 He came through many difficulties. 他經歷了許多磨難。