形容词
1. A library is indispensable to a college.
大学里图书馆是必不可少的。
2.
2. She's become quite indispensable to the company.
她已成了公司里少不了的人。
3. Water is indispensable to plants.
水是植物不可缺少的。
4. Taking care of my parents is my indispensable duty.
照顾父母，我责无旁贷。