They breed twice yearly.

它们每年繁殖两次。

《新英汉大辞典》

Despite disruption at the busy brokerage firm, he insisted on holding twice-yearly evacuation drills by the stairwell for the firm's 22 floors in the south tower.

尽管他在繁忙的金融经纪公司倍受质疑，但他坚持要南楼22层的公司员工每年两次在楼梯井进行疏散演习。

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Twice-yearly design staff meetings alternate between strategy sessions in Sweden in the winter and trips in the summer chosen to provide designers with creative inspiration.

设计人员每年有两次大会，分别是冬季在瑞典举行的战略研讨会和意在让设计人员获得创意灵感的夏季旅游。

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This consultation is one Drucker and Warren have engaged in twice yearly for two decades.

FORBES: Peter Drucker On Leadership

Microsoft just announced it will be stepping up its release cycle too to twice yearly for Dynamics CRM.

FORBES: When Will CRM Officially Become Commoditized?

But it has now promised, if asked, to report twice yearly to Parliament through the Treasury select committee.

BBC: Sell-off of taxpayer-owned banks 'may take five years'