ahem

It is not unknown for valuable display items to go, ahem, missing.

贵重的展品，呃哼，丢失的话，会众人皆知。

Ahem, of course it's me, Grandma.

嗯, 当然是我, 奶奶.

Ahem, might I make a suggestion?

啊哼, 我可以提个建议 吗 ?

Professor Porter: Shall I, ahem, leave you and the blackboard alone for a moment?

波特教授: 可以吗, 嗯, 让你和你的黑白独自呆一会儿?

Ahem, I wonder if I could raise this problem with you now.

呃哼, 不知我现在能否向您提及这问题.

Ahem, I wonder if I can raise this problem with you mow.

呃哼, 我现在能否向您提及这问题.

Ahem, can I make a suggestion?

呃哼，我可以提个建议吗？

It can be a dangerous course of action which might be sound in theory but — ahem — perhaps a trifle risky in practice.

这可能是一次危险的行动，在理论上听着无缝可击，但——呃哼——真做起来却可能有点冒险。