They say the roads to Sa'ada governorate are blocked and there is no access to the conflict zone by air.

VOA : standard.2009.08.21

Several camps for displaced people have been set up in Sa'ada city and other nearby governorates.

VOA : standard.2009.08.21

sa So we have 1 s a, and we're drawing this as having a positive amplitude, but since we have destructive interference we're going to draw 1 s b as having the opposite sign, so we have a plus and a minus in terms of signs.

我们有，我们把这画成一个正的振幅，但因为我们是相消干涉,我们把1sb画成相反的符号，所以我们有一正一负两个符号。

化学原理课程节选 : 麻省理工公开课

But,he says,distribution of aid to displaced people in Sa'ada has been suspended due to the fighting.

VOA : standard.2009.08.21