顶多: at most, at best...
参与: to participate (in sth)...
棉花: cotton...
发烧: to have a high temperature (from illness), to have a fever...
抓紧: to grasp firmly, to pay special attention to, to rush in, to make the most of...
点头: to nod...
截: to cut off (a length), to stop, to intercept, section, chunk, length...
金属: metal...
盖章: to affix a seal, to stamp (a document), to sign off on sth...
专用: special, dedicated...
