a certain smile meaning in Chinese

某种微笑
一笑缘

Mr . rochester had sometimes read my unspoken thoughts with an acumen to me incomprehensible : in the present instance he took no notice of my abrupt vocal response ; but he smiled at me with a certain smile he had of his own , and which he used but on rare occasions
罗切斯特先生有时有一种我所无法理解的敏锐，能看透我没有表露的思想，眼下他没有理会我唐突的口头回答，却以他特有而少见的笑容，朝我笑笑。