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Unit 5 Into the unknown
1．Yellowstone National Park offers a variety of(各种各样的) ranger programs throughout the
park，and throughout the year.
2．Kids can test their skills and compare their abilities to(与……相比较) the animals of
Yellowstone.
3．Stay for(逗留) as little or as long as your plans allow.
4．Discover why artists and photographers continue to be drawn to(被……吸引) this special
place.
5．The ruins of a huge Maya city have been discovered in Guatemala with the help of(在……的
帮助下) the remote sensing technique LiDAR，according to the National Geographic on Thursday.
6．LiDAR is exceptionally useful for detecting(vt.侦察出；发现) archeological sites，as it gets
through(通过) jungles and other features that hold up(阻碍；延误) exploration on the ground.
7．This large lost city envelops(vt.覆盖) sites like Tikal，Holmul，and Witzna—known for
their pyramids—but shows that these famous heritage areas are the tip of the iceberg(冰山一角)
of this lost urban network.
8．Hidden under the jungles of the Maya Biosphere Reserve(n.保护区)，more than 60,000
human-made features—homes ， canals ， highways ， some of which can even reach the
modernized standard(达到现代化的水平)—have been identified(vt.确认；识别；鉴别) by an
international cooperation of researchers headed by the PACUNAM Foundation，a Maya cultural
and natural heritage organization.
9．There are entire cities we didn’t know about now showing up(出现) in the survey data...
10．Data suggests that sea ice is thinning(v.thin 使稀薄) over time due to climate change.
11．However，existing(adj.现存的 v．exist存在 n．existence 存在) ways of measurement do
not provide a clear and continuous picture of the state of sea ice.
12．Unfortunately(adv.不幸地 n．fortune 机遇；好运；财富 adj.fortunate 幸运的
adv.fortunately幸运地)，satellite-based sea ice thickness measurements are inaccurate during the
summer months：the time of the year with the greatest melting.
13．As a result(因此；结果)，the simple calculation (ice level－sea level) does not work as
radar systems are unable to differentiate between ocean water and ice，thus making(making为现
在分词作结果状语) measurements inaccurate(adj.不精确的；不准确的)．
as a result因此；结果
as a result of由于；因为
result in导致；结果是result from...由……产生；由……引起
14．The research team led(过去分词作后置定语) by Jack Landy，a scientist at the University of
Tromsø (The Arctic University of Norway)，used the new method to distinguish between
seawater and(区别……和……) ice.
