What is the translation of " 它们一直是 " in English?

• they have been
• they are always

Examples of using 它们一直是 in Chinese and their translations into English

纵观历史，它们一直是防范经济和政治动荡的一种手段。
Historically they have been a hedge against economic and political instability.

它们一直是我们最信赖的合作伙伴.
They have been our most trusted collaborators.

最近，它们一直是艺术品。
More recently, they have been works of art.

从某种意义上说，它们一直是。
In some sense they always were.

它们一直是合作伙伴。
They have always been their partners.

它们一直是，也将永远是平板电脑的配角。
PTE was and always will stay being computer-based.

真实的忏悔：它们一直是我最喜欢的糖果之一。
True Confessions: This was one of my favorite issues.

然而，它们一直是潜在的威胁。
She's always been a potential threat.

从某种意义上说，它们一直是。
In some sense, they always have been.

因此，它们一直是科研人员主要的研究和模拟对象，目的是为了创造出先进的人工结构材料。
Therefore, they are always a research subject for scientists aiming to create advanced artificial structural materials.

它们一直是无数个历史传说的主体，漂亮、神秘、优雅。
They have been the subject of countless tales of history, beauty, myth and elegance.

因此，它们一直是科研人员主要的研究和模拟对象，目的是为了创造出先进的人工结构材料。
Therefore, they are always the main object for researchers to investigate and imitate aiming to create advanced artificial structural materials.

它们一直是创立判例的先行者，是启发所有必须处理此类罪行的国家和国际司法管辖机构的源泉。
They have been forerunners in creating jurisprudence that is a source of inspiration for all national and international jurisdictions that will have to address such crimes.

它们一直是许多研究的主题，因为它们表现出令人兴奋的独特特性，可以根据其组成对其进行调整。
They have been the subject of many studies because they exhibit unique properties that can be tuned according to their composition.

我们喜欢比较新世界和旧世界的支柱，因为坦率地说，它们一直是衡量的标尺。
We like to compare New World pours against the Old World pillars because, quite frankly, they have been the measuring stick.

因为这些途径是“保守的”，这意味着它们已经通过进化传给了人类，所以它们一直是深入研究的主题。
Because these pathways are"conserved," meaning they were passed down to humans through evolution, they have been the subject of intensive research.

刘永升：过去几年，它们一直是围棋AI的王者，为围棋AI的发展做出了很大的贡献。
Liu: Over the last few years, they were the masters at AI Go, and they made great contributions to AI Go.

然而，到目前为止，找到它们一直是缓慢而繁琐的工作。
So far, though, finding them has been slow and tedious work.

自从1967年日本议会会议宣布三大原则以来，它们一直是日本"军火"出口的基本政策。
The Three Principles have been the basic policy concerning Japan' s" arms" exports since they were declared at the Diet session in 1967.

这两种（以及所有其他回归算法）都以它们的速度而闻名，它们一直是最快速的机器学习算法之一。
Both these(and all other regression algorithms) are known for their speed; they are consistently ranked among the very fastest machine learning algorithms.

自从推出蒂沃机顶盒以来，大概是八、九年前，直到今天，它们一直是市场上唯一的最高品质的产品，这没有任何异议。
From the time TiVo came out, about eight or nine years ago, to this current day, they are single highest quality product on the market.

由于“流氓”免疫细胞在血液样本中如此罕见(不到400个细胞中的一个)，因此研究它们一直是一个挑战。
Because'rogue' immune cells are so rare in a blood sample- less than one in 400 cells- studying them has been a challenge.

从自愿调查的答复中找到以下对区渔管组织执行《协定》的主要制约，它们一直是1995年后成立的区渔管组织谈判中棘手的讨论内容。
The following key constraints to implementation of the Agreement through RFMOs were identified among responses to the voluntary survey and have been the subject of difficult discussion in the post-1995 RFMO negotiations.

它一直是，而且仍然经常被种植作为观赏植物。
They were, and often still are today, used as flock guardians.

所以，毫不奇怪它一直是最畅销书之一。
No wonder it is one of the best selling books of all time.

它一直是联合国的一个有益的伙伴。
It had been a useful partner to the United Nations in the past.