Earth and Mars orbits align only once every two years.

地球和火星的运行轨道每两年才连成一线。

He was cut once and only once.

他只被划了一刀。

Yeah, well, Christmas comes only once a year.

是呀 嗯 圣诞节一年才来一次呢。

People use many of these plastic products only once.

许多塑料产品人们只使用一次。

Female dragons come into season only once a year.

雌性巨蜥一年发一次情。

Only once that's done should they go to research.

只有这样做了之后，他们才应该去进行下一步研究。

The recordings will be played only once.

录音只读一遍。

The passages will be read only once.

每段短文只读一遍。

Both the conversations and the questions will be spoken only once.

对话和问题都只读一遍。

Only once did Tess try to get closer to her husband.

苔丝只尝试过一次去接近她的丈夫。

And it reveals that meat-eating dinosaurs evolved twice, but feathers only once.

这就表明，肉食性恐龙进化了两次，但羽毛只进化了一次。

It's a diary and a sketchbook only once called art journal.

这既是一本日记又是一本素描画本，是曾经的艺术杂志。

It's only once in a while that we actually see one.

只有在偶然间我们才会真正看到它们。

Only once it was safely in did Ove nonchalantly swing into the other space.

等它完全停好，欧维才稳稳地拐进跟前的车位。

In Mali, the fish in this lake are shared out only once a year.

在马里，每年人们只能在这片湖里捕一次鱼。

After each item, which will be read only once, there will be a twenty-second pause.

每段新闻只读一遍。每段新闻后有 20 秒钟的停顿。

But they have to be spotted only once and these shells may not pass overhead.

但只要被发现一次，这些炮弹可能就不会顺利地从头顶飞过。

The FAA grounded it only once all other big regulators around the world had done so.

但FAA在全球所有其他大型监管机构停飞该机型后才宣布停飞。

So, a moderately loud noise occurring nearby only once would allow the ear to potentially recover.

因此，只发生一次中等响度的噪音的话，听力是有可能恢复的。

Only once before in U.S. history have these two paintings been brought together in this way.

美国历史上，这两幅画组合在一起的次数也只有1次。