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重点讲解：
1. die from 死于；
Forty-thousand children a day die from preventable diseases.
每天有4万个孩子死于本可以预防的疾病。
2. in order to 为了；以便；目的在于；
In order to get a complete picture, further information is needed.
为掌握全面情况，还需要详细资料。
3. guard against 提防；防范；
The armed forces were on high alert to guard against any retaliation.
武装部队保持高度戒备，以防发生任何报复行动。
4. thanks to 幸亏；由于；因为；
It was all a great success─thanks to a lot of hard work.
由于尽心竭力，这才大获成功。
