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

And I get down to a certain card and I am stumped, so I will leave a space waiting for that card to appear on cue.

我遇到某张牌,会被困住，我会留些地方给,恰好要出现的牌。

麻省理工公开课 - 固态化学导论课程节选

Well, this stumped people for awhile Linus Pauling until another fellow came along: Linus Pauling.

这让人们为难了很久,直到另一个人出现。

麻省理工公开课 - 固态化学导论课程节选