形容詞 pivotal:

1. being of crucial importance
   同義詞：polar

1. The capital and largest city of Algeria, in the north on the Bay of Algiers, an arm of the Mediterranean Sea. An ancient North African port, Algiers was captured by French forces in1830 and was later a pivotal center of the struggle for Algerian independence. Population, 1,523,000.
   阿爾及爾阿爾及利亞的首都和最大的城市，位于地中海海灣阿爾及爾灣的北面。阿爾及爾是一個歷史悠久的北非港口，于1830年為法軍所占領(lǐng)，以后又成為阿爾及利亞獨立運動的中心。人口1,523, 000

piv.ot.al

adj.（形容詞）
Of, relating to, or serving as a pivot.
樞軸的：樞軸的、與樞軸相關(guān)的或作為樞軸的
Being of vital or central importance; crucial:
中樞的，關(guān)鍵的：起中心的或極重要作用的；關(guān)鍵的：
例句：
.Its pivotal location has also exposed it to periodic invasions.(Henry A. Kissinger)
.其地點的重要性也使得它周期性地遭受侵略.(亨利A.基辛格)

【引伸】
piv.otally
adv.（副詞）