crucial part的用法和樣例：
例句
- Some veterinarians believe that annual revaccination is an important and critical part of preventative health care.
一些獸醫指出每年的疫苗是衛生保健中一項重要且關鍵的部分。 - The tantalum spinneret is a key part in chemical fibre silk spinning_machine.
噴絲頭是化纖紡織機上的關鍵部件。 - Frequency synthersizer is one of the important part of the passive small type Rb frequency standard.
頻率綜合器是被動式小型銣原子頻標的關鍵部件之一。
