and should not be put in drinks unless it is known to be safe.
只有知道冰块安全时才能加入饮料。
新概念英语第四册 Lesson 38 Water and the traveller

📚 句中词汇解析

从本句中提取的重要词汇

unless [ən'lɛs] 词频1
conj. 除非，如果不; prep. 除了，…除外;
"The cultural life of the country will sink into atrophy unless more writers and artists emerge."
如果没有更多的作家和艺术家出现，这个国家的文化生活将衰退。
近义：save, except
safe [sef] 词频1 词根: 服侍
adj. 安全的;保险的，肯定的;无损的;提供保护的; n. 保险箱，保险柜;冷藏箱;〈俚〉避孕套;
💡 被save（拯救）已safe（安全）
"The family jewels are locked away in a safe."
家里的珠宝首饰都锁在保险柜里。
近义：strongbox, vault, innocuous, inoffensive, offenceless, riskless 反义：hesitant, hesitative, infirm, irresolute, shaky, skeptical
known [nəun] 词频1
adj. 大家知道的;已知的;知名的;向某人作自我介绍; v. 知道( know的过去分词 );看到过;听到过;经历过;
"There is no known antidote to the poison."
这种毒的解药尚未发现。
近义：acknowledged, familiar, noted, reputable, reputed 反义：ignored, obscure, unadmired, unbeknown, unfamiliar, unidentified
drinks
n. 饮料, 饮品；喝酒（drink复数）

📚 更多「新概念英语第四册」例句

We can read of things that happened 5,000 years ago in the Near East,
我们从书籍中可读到5，000 年前近东发生的事情，
they do not realize that they are deprived of the necessities of life.
却没有意识到被剥夺了生活所必需的东西。
if, in a word, beauty means something, yet we must not seek to interpret the meaning.
一句话，如果美有某种意义的话，我闪，千万不要去阐明它的意义。
From the Skeppsbron and surrounding islands the people watched this thing of beauty begin to spread her sails and catch the wind.
人们从斯开波斯布朗和周围的岛屿前来观看这艘美丽的战船扬帆起航，乘风前进。
and particularly by a new consciousness of the philosophical undercurrents in the scientific revolution,
尤其是以科学革命中哲学潜流的新意识为依据，
The former method simply consists of setting an elephant to work and beating him until he does what is expected of him.
强硬法就是驱使象去干活，把它打到顺从为止。