一年两次的；

Happening twice each year;

一位牙医一年两次为那个小学生检查牙齿。

Eg: A dentist inspects the pupil's teeth twice a year.

成员国还须一年两次报告所有调查的结果。

They must also report on all investigations twice a year.

一年两次，春分和秋分，太阳从正东方升起。

Twice a year, at the Spring and Fall equinox, the Sun rises due east.

据路透社报道，周五开始的一年两次的伦敦男士时尚周将接待50名左右的设计师。

According to Reuters, the twice-yearly London Fashion Week Men's, which kicks off on Friday, will host around 50 designers.

像一年两次或多年生的植物以及像高粱、柳树以及各种杂交灌木作为一种可选的化石燃料都广受欢迎。

Plants such as biannual or perennial grass, and shrubs like sorghum, willow and miscanthus, have been hailed as a biomass alternative to fossil fuels.

哪里的作家一般都是身为父母或是已经工作的人，他们定期与他们的教师通信，而且一年两次他们来到本宁顿呆一段日子。

The writers, often parents or working people, exchange letters with their teachers regularly, and then come in to Bennington for a few days twice a year.