Responsibility and moderation were to be the keynotes of their foreign policy.是什么意思？

Responsibility and moderation were to be the keynotes of their foreign policy.

责任和克制将是他们外交政策的核心。

responsibility

n. 责任，职责，责任感，责任心，负责任；

例句
Many parents simply abdicate all responsibility for their children.
许多父母对孩子简直是完全撒手不管。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

moderation

n. 适度，自我节制，稳定，镇定，（牛津大学）B.A学位的第一次考试；

例句
Responsibility and moderation were to be the keynotes of their foreign policy.
责任和克制将是他们外交政策的核心。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

be

v. 是，有，存在，做，成为，发生；aux. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质；

例句
The older child should be able to prepare a simple meal...
那个年纪稍大的孩子应当会做一顿简单的饭菜。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

keynotes

n. 要旨( keynote的名词复数 )，主题，<音>主音，定基调的人；

例句
Responsibility and moderation were to be the keynotes of their foreign policy.
责任和克制将是他们外交政策的核心。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

foreign

adj. 外国的，外交的，外来的，不相干的，[医]异质的；

例句
The Colonial Office was absorbed into the Foreign Office.
殖民部被并入了外交部。

policy

n. 政策，策略，保险单，策略性；

例句
We have seen this as an attempt to place the blame for a policy that has gone adrift.
我们已经认识到，这是把责任归咎于一项已偏离方向的政策的一种企图。