1.   American embassies should have their building facades reinforced, their glass coated with plastic film to prevent shattering, and their security perimeters extended.

2.   Despite intelligence warnings about a possible terrorist attack, Air Force commanders made only a feeble effort to extend the perimeter.

3.   The security perimeter was extended Thursday afternoon beyond the White House grounds to Lafayette Park and adjacent streets and government office buildings.

4.   The security perimeter has been extended on several occasions into nearby city streets to keep potential truck-borne bombs away from the complex.

5.   Hundreds of soldiers occupied the plaza around the palace this morning, and the barbed wire perimeter was extended.

6.   Hundreds of soldiers occupied the plaza around the palace this morning and the barbed wire perimeter was extended.

7.   US military officials said that Saudi Arabia had twice rejected requests to extend the perimeter after the November attack, but gave no reason for the refusal.

v. + perimeter >>共 83
patrol 15.63%
guard 10.27%
line 4.02%
set_up 4.02%
establish 3.57%
extend 3.13%
defend 3.13%
secure 3.13%
expand 2.23%
mark 2.23%
extend + n. >>共 1100
deadline 4.76%
invitation 2.53%
contract 2.39%
loan 2.28%
life 2.14%
lead 2.12%
mandate 1.82%
gain 1.80%
hand 1.78%
self-rule 1.67%
perimeter 0.09%
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