So while Stone occasionally directed episodes in the early years of the show, he's found his niche as the person who coordinates the episodes, making sure they arrive on time and under budget.

所以，虽然斯通在节目的早年偶尔负责导演，他发现更适合他的还是整合每一集，确保能在预算之内按时交货。

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However,occasionally even they are stumped, and when that happens they have to consult other experts, many of whom are found at the Smithsonian Museum of Natural History in Washington,D.C.

VOA: standard.2009.12.08

Even ministers were seen travelling standard class with the rest of us - although they occasionally found themselves upgraded courtesy of First Great Western between Wales and London.

BBC: Wales Office's ?43,649 trade mission flights bill

Yet when experimentalists began to investigate it, they found that, just occasionally, there was something wrong.

ECONOMIST: Particle physics

But a year later in 2011, among the same group of children, now aged 13, 2% were found to smoke regularly, 4% smoked occasionally and 3% said they used to smoke.

BBC: '570 children a day' start smoking