TITLE=SCIENCE REPORT - Largest Cell Phone Study
( Start at 59")This is the VOA Special English SCIENCE REPORT.
Scientists have completed the largest study yet on the safety of (1)cellular (2)telephones. The study (3)involved more than four-hundred-twenty-thousand people in Denmark.
The researchers found that cell phone users are no more likely than other people to develop (4)cancer. However, the study failed to end the (5)debate over cell phone safety. Critics say it will be years before evidence of cancers linked to cell phone use is (6)confirmed.
Cellular telephones may be the best-selling (7)electronic devices in the world. Cell phones are small, wireless devices. They are held close to the user’s head during normal use. Their widespread use has led to increased concerns about possible health risks.
The (8)antennas on these phones produce low levels of radio wave radiation while in use. Most of the debate about the phones involves the amount of radiation they release. Scientists know that intense (9)electromagnetic (10)radiation can harm human tissue. But they are not sure if the radiation from cell phone antennas could cause serious damage.
The Danish Cancer Society and the International Epidemiology Institute near Washington, D-C organized the new study. Researchers identified Danes who began using cell phones between Nineteen-Eighty-Two and Nineteen-Ninety-Five.
The researchers compared this information with Danish health records. The researchers found that the cell phone users developed the expected numbers of cancers. They found no increased risk for cancers of the brain, nervous system, mouth or blood.
The Journal of the National Cancer Institute published a (11)commentary with the study. Robert Park of the American Physical Society wrote that cell phones are dangerous - when people use them while driving cars. He said the large number of people in the study makes it difficult to question the findings that cell phones do not cause cancer. Recently, two smaller American studies also found no increased cancer risk.
Not everyone agrees, however. For example, researcher George Carlo has written books about cell phone safety. He says other studies suggest that cell phone use may (12)damage genes. He warns that cancers of the brain develop over many years.
This VOA Special English SCIENCE REPORT was written by George Grow.
(1) cellular[ 5seljulE ]adj.细胞的,多孔的; 蜂窝状的; 泡沫状的
(2) telephone[ 5telifEun ]n.电话, 电话机v.打电话
(3) involve[ in5vClv ]vt.包括, 笼罩, 潜心于, 使陷于
(4) cancer[ 5kAnsE ]n.癌, 毒瘤
(5) debate[ di5beit ]v.争论, 辩论n.争论, 辩论
(6) confirm[ kEn5fE:m ]vt.确定, 批准, 使巩固, 使有效v.确认, (基督教中)给...行按手礼
(8) antenna[ An5tenE ]n.天线
(10) radiation[ 7reidi5eiFEn ]n.发散, 发光, 发热, 辐射, 放射, 放射线, 放射物
(11) commentary[ 5kCmEntEri ]n.注释, 解说词
(12) damage[ 5dAmidV ]n.损害, 伤害v.招致损害n.[律] (用复数)赔偿金