regretably

Regretably I didn't get a picture of him as he disappeared quickly down the line... drat!

可惜由于他太人群消失，我能拍到他……可恶！

Regretably, I cannot watch the lively scene in the meeting and the presents distributed by companies present at the meeting .

遗憾是能看到此次展会火爆场面和参展商赠品。