1. 对...必不可少：17.发挥着日益重要的作用play an increasingly important role in ... | 18.对...必不可少be indispensable to ... | 19.正如谚语所说As the proverb goes:
2. 对......必不可少的：23.the rate of success 成功率 | 24.be indispensable to... 对......必不可少的 | 1.be unaware of... 没有注意到
3. 对......不可缺少的：16.be complementary to... 对......的补充 | 17.be indispensable to... 对......不可缺少的 | 18.be indicative of... 暗示
4. 对......是不可缺少的：reduce sth. to a minimum 把......降至最低限度 | be indispensable to对......是不可缺少的 | make little sense 意义不大,没什么用
1. People with a traditional education background believe dishwashing by hand to be an indispensable part of living.
2. NGOs may be an indispensable supplement to government efforts in many areas of social work.
3. A sound financial sector will be indispensable for the government to achieve all these goals.