Big Words (172)："使无必要"(动词)怎么说?

obviate( /ˈɒbvɪeɪt / ) the need for 使无必要

ob词根→against

viate词根→go，如via,deviate(偏离)(de词缀表away)

→go against 理解为把前进路上的障碍去除掉

nullify→/ˈnʌlɪfʌɪ / to make a legal agreement or decision have no legal force.

negate→/nɪˈɡeɪt/ to cause something to have no effect.

eg: The increase in our profits has been negated by the rising costs of running the business.