“东西丢了”如何表达？

lose /luːz/ 遗失；丢失 lose one's keys/job/weight/head 失去/遗失钥匙/工作/体重/理智 I lost my keys/job. 我丢了我的钥匙/工作 missing /ˈmɪsɪŋ/ 找不到的 My pen is missing . 我的钢笔不见了。 I can't find... 我找不到... I can't find my pen. 我找不到我的钢笔了。 Conversation: A: Hello, John. You look very upset. What's the matter with you? 你好，约翰，你看起来很沮丧，怎么啦？ B: There is something wrong with my computer. I lost the powerpoint presentation that we have been preparing for one month. 我的电脑出问题了，我丢失了那个我们已经准备了一个月的演示文稿。 A: You lost everything! No! It is very important. We need it for tomorrow morning. Do you have it on your USB drive? 你全部弄丢了？不！它很重要，我们明天早上还要用呢，你的U盘上有吗？ B: My USB drive is missing . Could you give me some advice? 我的U盘也丢了，你能给我提点建议吗？ A: You're so careless. But don't you save it on the computer? 你真是太不小心了，但是在你的电脑上没有保存吗？ B: No. it took up too much space, so I...