" Well, you can use this little whatsit to take out your SIM card."

“你可以这小玩意把你的 SIM 卡拿出来。”

Words like " thingy" or " whatsit" or " thingamajig" , these are not normally used in written English.

" thingy" ，" whatsit" ，" thingamajig" 这样的词通常不英语书面语中。

Why wasn't I warned that unifying the administration of the countryside would mean removing protected status from this beaver whatsit?

警告我，统一这些管理部门取消这海狸什么的保护区？

One man looked at the whatsit.

一人看了看这小玩意。

The whatsit was in the museum.

这小玩意被放进了博物馆里。

If, for example, you discover a small whatsit, and you can't really say whether it is animal, vegetable, or mineral – I don't think you would dare touch it.

例如，如果你发现了一小东西， 但你不能确定它是动物、植物还是矿物——我想你是不敢碰它的。

Uncle Vernon opened his mouth, closed it again, opened it once more, shut it, then, apparently struggling to remember how to talk, opened it for a third time and croaked, " So—so—they—er—they—er—they actually exist, do they—er—Dementy—whatsits? "

弗农姨父张了张嘴又闭上了，接着又张了张又闭上了，然后，显然是挣扎着回忆怎样说话。他第三次把嘴张开，声音嘶哑地说：“这么说——这么说——他们——嗯——他们——嗯——真的存，他们——嗯——这些死魂怪？”