abbr.通用性任务舱(Universal Mission Module)，通用模块天线杆(Universal Modular Mast)

Umm, I'm not sure if that's a good idea.
嗯，我不确定那是否是个好主意。
Umm, could you repeat that? I didn't quite catch it.
嗯，你能再说一遍吗？我没太听清楚。
Umm, let me think about it for a moment.
嗯，让我想一想。
Umm, I think we might need to buy more groceries.
嗯，我想我们可能需要买更多的杂货。
Umm, your shirt is inside out.
嗯，你的衬衫穿反了。
Umm, I'm afraid I can't make it to the meeting today.
嗯，恐怕我今天不能参加会议了。
Umm, do you know where I left my keys?
嗯，你知道我把钥匙丢哪儿了吗？
Umm, I don't think this is the right bus stop.
嗯，我认为这不是正确的公交站。
Umm, could you pass me the salt, please?
嗯，你能把盐递给我吗？
Umm, I've got a headache, I think I'll go home early.
嗯，我头痛，我想我会早点回家。