Phát âm chuẩn cùng VOA – Anh ngữ đặc biệt: Harmless Chemicals Cancer (VOA)

Published on 08/10/2015

Học tiếng Anh hiệu quả, nhanh chóng:, Nếu không vào được VOA, xin hãy vào để vượt tường lửa. Các chương trình học tiếng Anh miễn phí của VOA (VOA Learning English for Vietnamese) có thể giúp bạn cải tiến kỹ năng nghe và phát âm, hiểu rõ cấu trúc ngữ pháp, và sử dụng Anh ngữ một cách chính xác. Xem thêm:

Luyện nghe nói và học từ vựng tiếng Anh qua video. Xem các bài học kế tiếp:

Health: Luyện nghe nói tiếng Anh qua video: Chương trình học tiếng Anh của VOA: Special English Health Report. Xin hãy vào để xem các bài kế tiếp.

On their own, many chemicals are harmless to human health. But in combination with other chemicals, they may become deadly. That was the finding of a two-year study by a group of scientists. They were asked to investigate the cancer-causing possibility of chemical mixtures. Linda Gulliver was one of 174 scientists on the task force. They were told to study the cancer-causing potential of 85 chemicals. All 85 are considered to be common in the environment. Linda Gulliver is also on the medical faculty of Otago University in Dunedin, New Zealand. She says chemicals have the ability to form dangerous mixtures. Even simple minerals can become dangerous when mixed with chemicals from plastic or beauty products. While the chemicals are safe on their own, she says, the researchers found that many chemical mixtures cause cancer in human cells. Working in groups, the scientists explored how different chemical mixtures could lead to cancer. Ms. Gulliver’s team looked at the ability of different combinations to support the increase of malignant human cells. She says the current way to identify whether chemicals cause cancer is to test them one at a time. This method leads, she adds, to a long list of supposedly “safe” chemicals. She and her team say that approach to testing needs to change. An estimated one in five cancers has been linked to chemical exposure. It may be that a cancer-causing substance is not a single chemical at all; it could be a deadly combination. The task force published its findings in the journal Carcinogenesis.

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