定期的的英文：
periodic
periodical
Regular
stated

Do a stint in the service.
（定期的）兵役

scheduled airline
定期航线

endowment insurance [ assurance ]
人寿定期保险

Ships that ply(across)the South China Sea
(经)南中国海的定期班轮.

The cruise liner will sail out next week.
定期班轮下周出港。

Has this mower been regularly serviced?
这个刈草机定期维修了吗

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

Fluff up and air quilt regularly to maintain softness.
应定期将羊毛被抖松并晾晒以保持其柔软性。

For, of all exercise, that of dancing, he termed a voluntary and regular fit of distraction.
因为在一切娱乐中，他把跳舞称为神经错乱的定期发作。

Regular use of a body lotion will keep the skin soft and supple.
定期使用润肤乳液可以使皮肤保持柔软光滑。

juvenile period
幼年期(构成中心木质部的一段时期)

But this is a transitional period.
但这是个转变过程。

The period includes the legal period and the period designated by the people's court.
期间包括法定期间和人民法院指定的期间。

juvenile period
幼年期(构成中心木质部的一段时期)

But this is a transitional period.
但这是个转变过程。

The period includes the legal period and the period designated by the people's court.
期间包括法定期间和人民法院指定的期间。

Please regular the sound on that recorder.
请调节录音机的音量。

They run regular services.
它们提供有规律的服务。

Not regular or fixed;occasional
不规则的；非固定的；临时的