专业八级改错练习 第87期

Since 1965, when is equipment became operational, a
device called Eros has been helped to make sky traffic__1__
safe. Eros is short for Eliminate Range Zero System−
range zero meaning collision. Basically Eros is a computer
system measures, with great speed and precision, closing__2__
speed ( the speed at which two objects are approaching
each other ) and range ( the distance apart of the objects ).
Eros can warn aircraft approachable each other at jet__3__
speeds and can provide protection for as many as a thousand
aircraft in wide area. The pilot of an Eros−equipped aircraft
heading for a collision hear a warning noise in his ear−phones__4_
when his airborne computer calculates that he is within thirty
seconds or half a mile ( whichever occurs first ) of other aircraft.__5__
At the same time, a flashing red arrow on the device's indicator
panel instructs him to climb. Simultaneously, in the other aircraft, __6__
the signal is automatically reversed: the flashing arrow tells the
pilot to climb. The newer Eros II system can accommodate a total
of two thousands aircraft at one time within a 140−mile radius__7__
Every three seconds, each Eros−equipped plane automatically
reports to ground stations and to similarly equipped aircraft
their precise range, altitude and approach rate. The producers__8__
of Eros, the McDonnell Dougals Corporation in the U.S., are
now studying the fitting of Eros and will do more to make__9__
the sky safer: they shall also lighten the work of air−traffic__10__
controllers and increase the efficiency of airports.

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