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1·Tigers eat human beings only on rare occasions when food is scarce.

老虎只有在食物短缺的罕见的情况下吃人。

2·These adjustments can, on rare occasions, cause erroneous benchmark results.

这些调整虽然很少出现，但是可能导致错误的基准测试结果。

3·On rare occasions, you may discover that a transform is so messed up you can't continue.

在很少的情况下，可能会发现转换一团糟难以继续下去。

4·We teach people how to respect it and, on rare occasions, have it in moderation, he said.

他说：“我们教人们如何重视碳水化合物，并在个别情况下适当摄入碳水化合物。”

5·On rare occasions, avian influenza viruses have crossed the species barrier to infect humans.

在极少数情况下，禽流感病毒已跨越物种屏障，感染人类。

6·The Quarren lived in the depths, only surfacing on rare occasions and with great difficulty.

夸润人生活在海洋深处，罕有浮到水面，且上浮十分困难。

7·On rare occasions, an androgen-producing tumor may develop in the ovaries or adrenal glands.

罕见的情况下，卵巢或肾上腺可有产生雄激素的肿瘤。

8·Usually the judge and the registrar sit alone but on rare occasions the judge sits with a jury of eight.

一般法官和登记官都是独任审判，但在极其偶然的情况下也有法官同八人组成的陪审团一起审判。

9·On rare occasions, travellers from areas where Lassa fever is endemic export the disease to other countries.

在极少数情况下，来自拉沙热流行地区的旅行者将该病带到其它国家。

10·Avian influenza viruses are highly species-specific, but have, on rare occasions, crossed the species barrier to infect humans.

禽流感病毒具有高度物种特异性，但偶尔也跨越物种屏障，感染人类。