重点讲解：
1. used to do sth.
过去常常；过去曾；
eg. Emerging markets used to be known as the markets you couldn't emerge from in an emergency.
新兴市场过去常常被称作你在危急时刻脱不了身的市场。
eg. John used to visit his parents once a week when he worked as an assistant in the city.
约翰在城里当服务员的时候，总是每周去看望父母一次。
2. thanks to
幸亏；归因于；
eg. We had a bit of a drought last summer thanks to the heat-wave.
去年夏天，由于酷暑我们遭受了轻微的旱情。
eg. Thanks to the love and encouragement of her mother, she finally defeated the disease and faced the disability bravely.
后来多亏她妈妈的爱和鼓励，使她战胜了疾病并勇敢面对残疾。
3. at the beginning of
起初；开始；
eg. They usually play the national anthems of the teams at the beginning of a big match.
在大型赛事开始前，他们通常演奏参赛国国歌。
eg. At the beginning of the winter , supplies were laid in, in case heavy falls of snow should block the road.
为预防下大雪阻塞道路，在初冬人们就把生活必需品储备起来了。
