我心中有一个疑团百思不得其解的英文

i have in mind some doubts which really puzzle me

• 我:    I; my; me
• 心中:    at heart; in mind
• 有:    5年 fifteen years
• 一个:    one; a; an
• 疑团:    doubts and suspici ...
• 百:    a surname
• 不得:    cannot; mustn't; n ...
• 其:    his
• 解:    understand; see