探測(cè)山火神器

四川 孫必慧

山火給世界上一些地區(qū)帶來(lái)了毀滅性的打擊。 中國(guó)人民大學(xué)的化學(xué)家王亞培領(lǐng)導(dǎo)的研究人員說(shuō)，他們已經(jīng)開(kāi)發(fā)出一種傳感器，可以更早地探測(cè)到山火。

題材科技 說(shuō)明文體裁 文章詞數(shù) 建議用時(shí)約3416分鐘

難詞探意

1. eliminate /??l?m?ne?t/ v. 消除；排除

2. coordination /k?????d??ne??n/ n. 協(xié)調(diào)

3. choreograph /?k?ri?ɡrɑ?f/ v. 為……設(shè)計(jì)舞蹈動(dòng)作；編舞

4. dispatch /d??sp?t?/ v. 派遣；發(fā)送

5. shield /?i?ld/ n. 盾（牌）；保護(hù)物；屏障

6. transmitter /tr?ns?m?t?(r)/ n. 發(fā)射機(jī)

Wildfires have recently destroyed regions across the world. Hoping to cut back on harm, researchers led by Yapei Wang, a chemist at Renmin University of China, say they've already developed an advanced sensor to detect such flames earlier.

Most wildfires are reported by the general public,and other alerts come from routine foot patrols and watchtower observers. “Passing planes and satellites also occasionally spot something, but the fire appears on the ground,” Wang says. “When you see the fire from the sky, it's too late.”

The team says its new sensor can be placed near tree trunks' bases and send a wireless signal to a nearby receiver if there's a dramatic temperature increase. That heat also powers the sensor itself, eliminating the need to replace batteries. The team printed the substances onto ordinary paper to create a sensor for just $0.40, as described in June in ACS Applied Materials & Interfaces.

Jessica McCarty, a geographer at Miami University in Ohio, who wasn't involved in the study,says places like San Diego—where wild land and city meet—could potentially benefit from sensors like this. “When a fire breaks out in a canyon that extends to someone's property,” she says, “with such a device, you know that as a homeowner before the fire agency may have detected it.”

But improving coordination among the different agencies involved in firefighting is more essential to address, says Graham Kent, a seismologist (地震 學(xué)家) at the University of Nevada, Reno. “The whole way that you respond to a fire until it is put out is like a ballet,” he says. “You'd have to choreograph it just so, with resources allocated at precisely the right time and place from detection to confirmation to dispatch to extinguishing.”

Wang says his team's next steps are to extend the device's signal range beyond the current 100 meters, which can place a restriction on practical use, and to develop a protective shield for it. The effectiveness of the transmitter, McCarty notes, will also need to be tested in the field.

1. What is the second paragraph intended to convey?

A. Some main characteristics of wildfires.

B. The popularity of wildfires around the world.

C. The current regular ways of detecting wildfires.

D. The significance of developing the new sensor.

2. What can we know about the new fire sensor?

A. It is even sensitive to low temperatures.

B. It is relatively less power-consuming.

C. It is inexpensive and self-powered.

D. It works automatically at times.

3. What does the underlined word “that” in paragraph 4 refer to?

A. The new fire sensor. B. The fire agency.

C. The risk of a wildfire. D. The benefit of the sensor.

4. What is the key to fighting wildfires in Kent's opinion?

A. Using technology to detect fire. B. The cooperation between agencies.

C. The good firefighting management. D. Applying technology to putting out fire.

5. What is the disadvantage of the new fire sensor?

A. Its transmitter works ineffectively. B. It still lacks a protective shield.

C. It doesn't send signals far enough. D. It monitors a limited range of areas.

熟詞生義

The team says its new sensor can be placed near tree trunks' bases and send a wireless signal to a nearby receiver if there's a dramatic temperature increase.

place v. 放置

e.g. A diamond ring was placed in the birthday cake.