Correct or improve the translation of the following English sentences.原文：For weeks, central Russia has been in the grips of its worst-ever heat wave, which has caused probably thousands of fatalities. 译文：几周以来，俄罗斯中部地区深陷于历史上最严重的可能造成高达数千人死亡的热浪之中。

Correct or improve the translation of the following English sentences.原文：For weeks, central Russia has been in the grips of its worst-ever heat wave, which has caused probably thousands of fatalities. 译文：几周以来，俄罗斯中部地区深陷于历史上最严重的可能造成高达数千人死亡的热浪之中。 改译：

几周以来，俄罗斯中部地区深陷于历史上最严重的热浪之中，由此而造成的死亡人数可能高达数千。