斯蒂芬诺的手抓得更紧了，语气也更冷了。用英语怎么说？

斯蒂芬诺的手抓得更紧了，语气也更冷了。

Stefano's grip tightened and his tone became colder.

grip

n. 紧握，抓牢，握力，掌握，理解，能力，胜任；vt. 握紧，抓牢，吸引住：吸引…的兴趣或注意力，引起；vi. 抓牢，紧握：保持紧握；

例句
His father kept a tight grip on his collar in case he should make a bolt for the door.
他的父亲紧紧抓住他的衣领，防止他夺门而逃。

tightened

v. 收紧( tighten的过去式和过去分词 )，（使）变紧，（使）绷紧，加紧；

例句
...in 1987, when the government tightened fiscal policy.
在1987 年，当时政府紧缩财政政策

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

tone

n. [语]声调，语调，[画]色调，色泽，明暗，[乐]乐音，全音，全音程，[医]（正常的）健康状态；vt. 使更健壮，定调，使变调子，[摄影术]给…上色；vi. 带有某种腔调，呈现某种色彩，（颜色）调和（与 with 连用）；

例句
...the accusatory tone of the questions.
提问中带刺

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

colder

cold（寒冷的）的比较级形式；

例句
Something colder and chillier confronted him.
他正面临着某种更加寒冷、更加凄凉的东西.