sǐ jiǎo
意思解释：（Blind angle）防御工事外部的一个角度，防御一方的直接火力不能达到这个角度。 比喻形势、风气等没有影响到的地方。
名军事上指在火器射程之内而射击不到的地方。也指在视力范围内而观察不到的地方。②比喻形势、风气等尚未达到的地方:卫生～|扫盲～。…
The name points to the place that be in firearm cannon-shot and does not shoot on the military affairs. Also point to the place that be inside eyesight limits and does not observe. Does ② compare the situation, ethos place: that has not achieve ～ of eliminate illiteracy of man . ...
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