wǒ / bǎ / shǒu jī / gù dìng / zài / sān jiǎo jià / de / yún tái / shàng / zhǔn bèi / pāi / shì pín

我把手机固定在三脚架的云台上，准备拍视频。

I fixed my phone on the tripod head and was ready to shoot a video.