回复如下：

Dear HR Manager,

I am thrilled to accept the position offered by your esteemed company. Thank you for the opportunity to become part of your esteemed team.

I am pleased to confirm my acceptance of the offer letter received from your company. The role aligns closely with my professional goals and expertise, and I am eager to contribute to the success of your organization. The opportunity to work in a dynamic and international environment is particularly exciting for me.

The terms and conditions of the offer are satisfactory, and I am looking forward to starting my new role. I will ensure to provide a prompt response to any further details or formalities required to complete the employment process.

Thank you once again for your confidence in me. I am confident that together we will achieve great success. I am eagerly anticipating my official start date and the opportunity to contribute to your team.

解释：

亲爱的HR经理：

很高兴接受贵公司的职位。感谢您给我加入贵公司的机会。

确认接受offer。我很高兴确认已收到的贵公司的录用通知。这个角色与我的专业目标和专长非常契合，我期待为贵组织的成功做出贡献。有机会在一个充满活力和国际化的环境中工作，对我而言特别令人兴奋。

对offer的条款和条件表示满意。我期待着开始我的新角色。我将确保及时回应完成雇佣流程所需的任何进一步细节或手续。

再次感谢您的信任。我确信，我们一起将取得巨大的成功。我期待着我的正式入职日期，以及为团队做出贡献的机会。

这样的回复直接明了，表达了对职位的热情和对公司文化的期待，同时确认了接受offer的意愿，满足了外企对于职业态度和沟通效率的要求。