senti イディオム

---

essential to

necessary to为…不可缺少的
Water is essential to the growth of crops．水是庄稼生长所不可缺少的。
Hard work and perseverance are essential to success.努力工作和持之以恒是成功所不可少的。

---

in absentia|absentia

adv. phr., formal When the person is absent. Used in graduation exercises when presenting diplomas to an absent student or during a court case. On Commencement Day, Joe was sick in bed and the college gave him his bachelor's degree in absentia. (Latin, meaning "in absence.")

---

in absentia

in absentia
While not present, as in He was tried and convicted in absentia, or He was awarded his degree in absentia. This expression is Latin for “in absence”; its use in English dates from the late 1800s.