We have known for a long time that mutations occur occasionally in each of us, but have had to guess exactly how often.

Recent years, the legal disputes, due to the damages caused by the thrown objects off different kinds of structures, occur occasionally.

近年来，因建筑物抛掷物而引发的法律纠纷不断发生。

In the blossom boll stage, the average wind speed is low, and the disastrous strong winds occur occasionally;

花铃期平均风速最小，偶有灾害性大风；

Being lack of scientific risk assessment tools and scientific risk management system, the safety accidents occur occasionally in the process of city runnel construction.

由于缺乏科学风险评估工具和科学的风险管理体系，在现有城市隧道建设过程中，安全事故时有发生。

China is a major coal producer, the coal mine accidents and even some major and serious accidents also occur occasionally.

虽然我国是一个产煤大国，但是矿井事故甚至一些重大、特大事故还时有发生。

Vertical transmission of hepatitis B virus ( HBV) can occur occasionally despite vaccination of the child.

乙型肝炎病毒的垂直传播可能偶发于接种了乙肝疫苗的孩子中。

She has been hawking them at trade shows , particularly ones devoted to infection-control products.

她一直在各种展销会上推销这些领带, 特别是面向感染控制产品的展销会.

Inside the Grand Theater, there are five rehearsal halls that could be as dealers rooms.

大剧院共有五个排练厅,可用于道具展销.

This plane is bought from a commodities fair.

这个飞机是从展销会上买回来的.

We're also spending less on trade shows andand spending more online.

我们也在贸易展销会上投入更少并且在线上模式投入更多.

I bought several cane products at the commodities fair.

我从展销会上买了好几件藤器.

At the same time, the satellites are laying out their wares.

与此同期, 卫星们摊开了它们的展销铺子.

At the food sales exhibition, there are a lot of delicacies loved by all.

食品展销会上有很多众所喜爱品尝之佳品.

Graphic design and printing: sample, picture album, package, bag, poster, color page DM and instruction.

平面设计印刷: 样本 、 画册 、 包装 、 包袋 、 海报 、 彩页DM、说明书.

Where possible, damage that does occur should be readily detectable and accessible for inspection and repair.

如有可能，出现的损坏应能及时的发现并便于检查和修复。

Wallach, the Yale scholar, suggesting that wars would occur more readily and that a technological arms race would develop.

他提出高科技的军备竞赛可能让战争更容易爆发。

Her destiny seemed to be that of any other university professor.

那时，等待耶伦的命运看上去与其他大学教授没什么两样。

For most of Einstein's life, he worked as a university professor.

对于大多数的爱因斯坦的生命，他成为一名大学教授。

He is not a university professor?

他不是大学教授吗？

including a former university professor,

包括一个以前在大学任教的教授，

They even helped him to become a university professor with a wonderful pension.

他们甚至帮助他成为一名大学教授，享受着丰厚的津贴。