Scientists and engineers have invented filters and other met

Câu hỏi liên quan

• 

  Population growth rates vary among regions and even among countries within the same region.

  Chi tiết
• 

  As children we were very close, but as we grew up we just drifted apart.

  Chi tiết
• 

  I used to meet him occasionally onFifth Avenue.

  Chi tiết
• 

  The workforce is generally accepted to have the best conditions in Europe.

  Chi tiết
• 

  Many scientists agree that global warming poses great threats to all species on Earth.

  Chi tiết
• 

  Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.

  Chi tiết
• 

  She decided to remain celibate and devote her life to helping the homeless and orphans.

  Chi tiết
• 

  Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

  Chi tiết
• 

  During the five-decade history the Asian Games have been advancing in all aspects.

  Chi tiết
• 

  I prefer to talk to people face to face rather than to talk on the phone.

  Chi tiết