"Are you the parties who come with Miss Morstan?" he asked.
"I am Miss Morstan, and these two gentlemen are my friends," said she.
He bent a pair of wonderfully penetrating and questioning eyes upon us. "You will excuse me, miss," he said with a certain dogged manner, "but I was to ask you to give me your word that neither of your companions is a police-officer."
"I give you my wordon that," she answered.
「你們是摩斯坦小姐的同伴嗎？」他問道。
「我就是摩斯坦小姐，這兩位先生是我的朋友。」她說。
「對不起，小姐，」他以十分卑下的態度說道，「我奉命要您保證您的同伴中沒有警官。」
「我可以保證。」她回答道。
give you my word：在這裡應翻譯為「我向你保證」，意思等同於「I promise you」。
例如：
I give you my word of honour I won't tell your secret.
（我以名譽向你保證不說出你的秘密。）
I give you my word. I'll never leave you.
（我向你保證永不離開你。）
I give you my word that this won't happen again.
（我向你保證這種事不會再次發生。）