• the main method → the primary method / principal technique• fire-lighting → starting a fire / igni

• the main method → the primary method / principal technique• fire-lighting → starting a fire / igniting a fire• until → up to the time of• the mid 19th century → the middle of the nineteenth century⭐ remain + noun/adjective خیلی مهم است:remained the main method→ continued to be the main method⸻Fire-lighting was revolutionised by the discovery of phosphorus, isolated in 1669 by a German alchemist trying to transmute silver into gold.روش روشن کردن آتش با کشف فسفر دستخوش انقلابی شد؛ فسفر در سال ۱۶۶۹ توسط یک کیمیاگر آلمانی که تلاش می‌کرد نقره را به طلا تبدیل کند، جداسازی شد.Paraphrases:• was revolutionised → was radically changed / underwent a major transformation• discovery → finding / identification• phosphorus → a chemical element• isolated → separated / extracted• German alchemist → German practitioner of alchemy• trying to → attempting to / seeking to• transmute → transform / convert• silver into gold → change silver into gold⭐ was revolutionised by→ was dramatically changed byاین یکی از paraphraseهای بسیار محتمل در سؤال‌های IELTS است.⸻Impressed by the element’s combustibility, several 17th-century chemists used it to manufacture fire-lighting devices, but the results were dangerously inflammable. @ieltsfarhadچندین شیمی‌دان در قرن هفدهم که تحت تأثیر قابلیت اشتعال این عنصر قرار گرفته بودند، از آن برای ساخت وسایل روشن کردن آتش استفاده کردند؛ اما نتیجه به‌شدت آتش‌گیر و خطرناک بود.Paraphrases:• impressed by → influenced by / amazed by• element → chemical element• combustibility → ability to catch fire / flammability• several → a number of / various• 17th-century chemists → chemists from the seventeenth century• used it to manufacture → used it to produce / employed it to make• fire-lighting devices → fire-starting equipment / devices for lighting fires• results → outcomes• dangerously inflammable → extremely flammable / likely to catch fire dangerously⸻With phosphorus costing the equivalent of several days’ wages, fire-lighting devices using this element were not cheap.از آنجا که فسفر قیمتی معادل دستمزد چند روز داشت، وسایل روشن کردن آتش که از این عنصر استفاده می‌کردند، ارزان نبودند.Paraphrases:• costing → being priced at• the equivalent of → equal in value to / corresponding to• several days’ wages → income earned over several days• fire-lighting devices → fire-starting equipment• using this element → containing / utilizing phosphorus• were not cheap → were expensive / were costly⭐ the equivalent of→ equal to / worth the same asاین عبارت برای Matching / Sentence Completion / TFNG خیلی مهم است.بفرست برای اون رفیقت ک داره برای آیلتس آماده میشه@ieltsfarhad