当需要写关于灾难的英语作文时，可以从以下几个方面入手：

描述灾难的影响：

详细描述灾难发生的情况，包括灾害的类型、规模、受影响的人数等。例如：“What a disaster! So far, it's reported that more than 60,000 people died in the Sichuan earthquake.”

表达情感与态度：

描述灾难给人们带来的感受，如恐惧、悲伤、希望等，并强调面对灾难时应保持积极的态度。例如：“An old saying goes: Life is full of roses and thorns. As we all know, one’s life is full of unexpected events, some of which are wonderful and some of which are disastrous. Those heavy blows, such as, floods, snowstorms, and earthquakes, threaten to weigh one down. However, it’s even worse if one can’t drag himself out of the grief in that mental break-down is more serious than the disaster itself. Instead of indulging oneself in sadness, one should take positive attitude towards life and contribute to the reconstruction of his or her life and hometown.”

呼吁与建议：

提出在灾难面前应采取的行动，如救援、捐助、重建等。例如：“But don't let the earthquake ruin your life and take your sunshine away! We can do something, such as donating money and materials to the victims, to help them rebuild their homes and lives.”

反思与成长：

从灾难中吸取教训，反思人类与自然的关系，强调保护自然的重要性。例如：“Misfortune and fortune always accompany one another, just like thunder accompanying lightning. One of the lessons we should learn from disasters is to cherish nature and protect our environment, as natural disasters often remind us of our fragility and the need for sustainable practices.”

通过以上几个方面的内容，可以构成一篇关于灾难的英语作文，既能展现灾难的严重性，又能表达出积极面对灾难的态度和呼吁，同时也能引发读者对人与自然关系的思考。