Another placeholder is whatsitsname (what's its name) , all this is one word, what's its name.
另一个占位符是 whatsitsname（它叫什么来着），所有这些都是一个词，它叫什么来说。
英语百科
Placeholder name
Placeholder names are words that can refer to objects or people whose names are temporarily forgotten, irrelevant, or unknown in the context in which they are being discussed.