By nature; essentially
本质上；实质的
He is in essence a reclusive sort.他本质上具有一种隐士的气质
He is in essence a reclusive sort.
他本质上具有一种隐士的气质
Of the greatest importance; crucial
极其重要的：极其重要的；决定性的
Time is of the essence.时间就是生命
Time is of the essence.
时间就是生命