这位第一次坐飞机的乘客紧紧抓着扶手。

The ___first-time flyer gripped the armrest tightly.

作为一名首次购房者，他仔细研究了所有贷款选项。

As a ___first-time homebuyer, he carefully researched all the loan options.

第一次用户注册时可享受特别优惠。

___First-time users get special discounts when they sign up.