Some valleys are formed by flowing water, and others are formed by glaciers.

一些山谷是由流水形成的，另一些是由冰川形成的。

A procession was immediately formed by those engaged in the search.

参与搜寻的人们立刻排成一队。

This alloy is formed by the fusion of two types of metal.

这种合金是用两种金属熔合而成的。

The rusticles are formed by living organisms.

锈块是由生物形成的。

They are believed to be formed by collapsed stars.

科学家认为，黑洞是恒星碰撞后形成的产物。

Chinese words are formed by putting together different characters.

汉语中的词汇是由不同的汉字组合而成的。

The mob was formed by supporters of President Donald Trump.

这群暴徒是唐纳德·特朗普总统的支持者。

They live in the largest assemblies formed by any monkeys.

它们生活的社群是所有猴类中最大的。

It was formed in 1949 by European countries and the U.S.

北约组织在1949年由欧洲国家和美国共同建立。

ECOWAS is the economic group formed by 15 West African nations.

西非经共体是由15个西非国家组成的经济组织。

Each nerve is formed by a dorsal and a ventral root.

每支脊神经都由腹根和背根组成。

The group was formed by Sempra Energy which owns a gas company.

该组织是由拥有一家天然气公司的桑普拉能源公司成立的。

And they weren't formed by anything that fell from the sky.

不是由外部撞击所形成的。

There was a red screen formed by flowing blood, as it were.

有一个由流动的血液形成的红色屏幕。

The notions of Dryden were formed by comprehensive speculation, those of Pope by minute attention.

德莱登的观念源于综合推断，而蒲伯的观念成因于细微的观察。

They're formed by the interaction of sand with wind.

它们是由风沙相互作用形成的。

A second explosion happened when hydrogen was formed by hot water steam contacting zirconium.

当过热的水蒸汽接触锆形成氢气时，发生了二次爆炸。

The islands were formed by volcanoes which have been dormant for over 200 years.

两个岛屿均是休眠了两百多年的火山岛。

Because they are an incredible example of self-organization and patterns formed by physics alone.

因为它们是单靠物理学形成的自发组织和图案，非常不可思议。

Like ripples, dunes are also formed by the interaction of wind and moving particles.

像涟漪一样，沙丘也是由风和移动粒子的相互作用形成的。