reserve, spare, alternate, backup

adj. 情绪低，信心不足（跟“乐观”相对） pessimistic (as opposed to "乐观 optimistic")

n. 编辑、出版报纸的机构 newspaper office, news agency

to compile

v. 保护（生命、财产、权利等），使不受侵犯和破坏 to protect (life, property, rights, etc.) so that they are not violated or damaged; n. 起到保护作用的事物 something that plays a protective role, guarantee, safeguard

to promise to keep sth in good repair, guarantee, warranty