1.
an interrogative adverB; an interrogative particle.
疑问副词，疑问助词
2.
A Probe into the Mechanism of Interrogative Sentences and Their Principal Derivatives form Contexts;
疑问及疑问衰变──谈英语疑问句语法化问题
3.
"The language of eternal question."
“是永恒的疑问。”
4.
relating to the use of or having the nature of an interrogation.
与疑问相关或者具有疑问的特点。
5.
What's the difference between a direct question and an indirect?
直接疑问句和间接疑问句有什么不同？
6.
Study on the Usage of Non-Interrogation of Interrogative Pronoun "Shenme(什么)";
疑问代词“什么”非疑问用法的历时考察
7.
The Topic-in Question and Proposition-in Question in the Interrogative System of Shanghai Dialect;
上海方言的话题疑问句与命题疑问句
8.
Is the Chinese Particle “Ne” a Question Operator in Wh-questions?;
语气词“呢”在疑问句中是疑问算子吗?
9.
The Non-interrogatory Usage of Interrogative Pronouns in the Book of Xun Men Ren
从《训门人》看疑问代词的非疑问用法
10.
None of your quiBBling, None of your questioning. None of your douBts.
不许含糊其词，不许疑问，不许怀疑。
11.
None of your qubbling. None of your questioning. None of your doubts
不许含糊其词，不许疑问，不许怀疑
12.
To mark or annotate with an obelus.
加疑问号标或注存疑符号的
13.
His allegiance has never been questioned.
他的忠心是毫无疑问的。
14.
No doubt she will be very glad.
毫无疑问她会非常高兴。
15.
There is no doubt that he is guilty.
毫无疑问，他是有罪的。
16.
There is no doubt of (or, as to) his being guilty.
毫无疑问他是有罪的。
17.
There is no question about his honesty.
他的诚实是毫无疑问的。
18.
Questions tug at his mind.
他心里冒出一些疑问。