crucial

adj. /ˈkruːʃl/ B2

至关重要的；决定性的

Extremely important because it affects the outcome of something.

仙境例句

Knowing which side of the mushroom was which was crucial, or Alice might grow forever.

分清蘑菇的哪一边是哪一边至关重要，否则爱丽丝可能会一直长下去。