If there is no year element, then the call will return null.

如果没有year元素，则调用返回一个空值。

youdao

It snowed the day before — giving a strange feeling at a time of year when there is virtually no darkness — but on Sunday the sun blazed across the water.

前一天下了雪——在一年中几乎没有黑暗的时候，会有一种奇怪的感觉——但周日，太阳照耀着湖面。

youdao

There is considerable evidence that the number of new companies starting up this year will be no higher than it was last year.

有相当多的证据表明，今年新成立的公司数量不会比去年多。

youdao

There is no machine yet that can recognize faces or understand sentences at the level of a two-year-old human.

至今还没有任何机器,能够做到面孔识别,或是理解两岁儿童能够轻易理解的句子

耶鲁公开课 - 心理学导论课程节选

School starts at 6 for 99.5% of kids who attend the voluntary reception year (there is no other childcare for 6 year olds available).

BBC: Is five too soon to start school?

While it was a long-standing joke among tax and estate planners that 2010 would be a good year to die because there is no estate tax imposed in that year, in practice, this is less than certain.

FORBES

The BBC's security correspondent Frank Gardner says the latest video is important because it is the first new footage of Bin Laden seen in more than a year, even though there is no independent confirmation that it was actually filmed this year.

BBC: NEWS | Middle East | Arab TV airs 'Bin Laden footage'