Mum and I were just going out when it began to rain.
我和妈妈刚要出去，天就开始下雨了。
Dad was watching TV when it began to rain yesterday.
昨天开始下雨时，爸爸正在看电视。
Sometimes, however, we need to know additional facts about the relationship—when it began or how long it lasted, for example.
但有时候，我们还需要知道一些“关系”额外的信息，比如关系什么时候开始，持续多长时间。
The interval may be assumed to have been a major formative period in his life: he was 21 years old when it began, 31 when it concluded.
但是这段时间可以被认为是一个人的成形时间(formative period)：开始于他21岁，终止于他31岁那年。
The farmers kept on working in the fields when it began to rain.
下雨的时候，农民们还不停地在地里劳动。
Near NW-SE compressive folding occurred in early Yanshan orogeny, when it began to buckle.
燕山早期运动主要为NW-SE向的挤压褶皱作用，断裂带走向开始弯曲变形；
We have come through a difficult decade; one of new threats and new trials we didn't expect when it began.
我们刚刚度过一个艰难的十年，当它开始的时候我们未能预料到新的威胁和挑战。
They had not been flying for long, however, when it began to rain — as the second crow had expected it would.
可是，没飞多久，天就开始下起雨来——果然不出第二只乌鸦所料。
Tokuyama traces its roots back to 1918, when it began producing soda ash, one of the basic materials in various industries.
日本德山化工成立于1918年，当时主要生产应用于众多工业领域的化工原料：碳酸钠。
That's because who and what you're dealing with will look very different at the year's end from the way they did when it began.
这是因为你面对处理的人和事将会在年底变得与它们开始的时候不同。
She first performed the 4-minute song in Berlin in 2006, but it wasn't picked up in China until 2009, when it began doing the rounds on the Internet.
2006年在柏林，龚琳娜首次演唱了这首时长四分钟的歌曲，但直到2009年，这首歌曲才在国内网络上蹿红。
While striving to accomplish everything as soon as possible is admirable, it inevitably results in burnout, which leaves the situation worse than when it began.
想尽快完成所有的事情，这种精神的确可嘉，但也会不可避免的造成透支，反而让情况变得更糟。
She was one of the first 12 students to sign up for the MA in 'The Beatles, Popular Music and Society', when it began in 2009, and on Wednesday was announced as the course's first graduate.
她是第一批申请“披头士，流行音乐与社会”硕士专业的12人之一，该专业2009年开设，星期三她成为了第一个公示的该专业毕业生。
When it began, the women's daily rations were slashed to 1, 200 calories, while the men were allowed 1, 500.
实验开始后，将女性实验者每日热量摄入量减少至1200卡路里，而男性实验者则维持在每日1500。
When it began, the women's daily rations were slashed to 1, 200 calories, while the men were allowed 1, 500.
实验开始后，将女性实验者每日热量摄入量减少至1200卡路里，而男性实验者则维持在每日1500。
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