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

to stay warm, to protect against the cold

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

v. 保藏并管理 to store and manage; to take care of and keep; n. 做保藏管理工作的人 a person who does storage and management work; a custodian; adv. 表示很有把握 indicates being very sure or confident

reserve, spare, alternate, backup