翻译求助：请问“定期”用英语如何表达？

regular

定期: [ dìng qī ]

1. regularly
2. at regular intervals

其它相关解释:
<fixed term> <fixed due date> <periodical> <regular> <at fixed period> <at fixed periods> <termly> <regular intervals>

例句与用法:
1. 她定期前来为我们照看婴儿。
She regularly baby-sits for us.

2. 医生定期到这家进行拜访，检查婴儿有没有问题。
The doctor made periodic visit to the house to see if the baby was all right.

3. 他们定期会面。
They meet with great regularity.

4. 我并不是永久雇员，而是根据定期合同在此工作的。
I'm not a permanent employee; I'm working here on a fixed-term contract.

5. 这个餐馆有公共卫生部门官员定期前来检查.
The restaurant is visited regularly by public health officers.

6. 所有汽车都需要定期检修.
All cars require servicing regularly.

7. 兼职音乐教师定期到校授课.
Peripatetic music teachers visit the school regularly.

8. 内阁定期开会.
The Cabinet meets r