the year of grace meaning in English

耶酥纪元...年, 公元...年

We have so many worlds in the year of grace 1838 .
一八三八这么个好年头，我们的外界又这么多。 ”
Squire trelawney , dr livesey , and the rest of these gentlemen having asked me to write down the whole particulars about treasure island , from the beginning to the end , keeping nothing back but the bearings of the island , and that only because there is still treasure not yet lifted , i take up my pen in the year of grace 17 - , and go back to the time when my father kept the admiral benbow inn , and the brown old seaman , with the sabre cut , first took up his lodging under our roof
乡绅特里罗尼，利弗西医生，还有其余的那些先生们，早就要我从头至尾毫无保留地写下有关宝岛的全部详情只除掉它的方位，而那不过是至今那里仍有未被取出的宝藏的缘故。我在公元一七年提起了笔，思绪回到了当年我父亲开“本葆海军上将”旅店的时候，当时那个棕色皮肤带刀疤的老海员第一次到我们屋顶下来投宿。