The seasonal sea level change is of annual period and the second oscillation is of semi-annual period.

月平均海面以年周期振动为主，其次是半年周期。

youdao

In the absence of disturbances the surface temperature and basic currents are gradually set up by the excitement of solar radiation with an annual period.

在不计扰动的情况下，在具有年周期的太阳短波辐射的作用下，逐渐建立起下垫面纬圈平均温度梯度及基本气流。

youdao

This paper USES TKC to reflect the volume transport of Kuroshio through the Tokara strait, analyzes the intra-annual and annual period of the volume of Kuroshio.

利用验潮站海表高度差反演吐噶喇海峡黑潮的流量，分析了黑潮流量的年内和年际变化。

youdao

Security was already tight as Iranians observe an annual period of mourning.

VOA: standard.2009.12.22

For the Greeks, her mother's grief over this annual period was the reason for winter.

BBC: Rossetti painting of Oxford's Jane Morris to be sold

These couples can postpone enrolling until their workplace coverage ends without penalty and can then enroll without waiting until the annual enrollment period.

WSJ: Conquering Retirement: Couples Without Benefits

Borsheims said it had record sales during its annual discount period for Berkshire Hathaway shareholders partly because Warren Buffett served a stint as a salesman for the Omaha, Neb.

FORBES: Warren Buffett Boosts Jewelry Sales at Borsheims