first buy order

基本解释

First you must buy, order, and wait to install your new hardware.
首先，必须购买、订购和等待安装新的硬件。
Sometimes, we buy things without thinking. Some people who dislike shopping grab the first thing they see, or prefer to use mail-order or the Internet.
有时候，我们不加思索地购物，有些不喜欢购物的人匆匆忙忙地抓起自己第一眼看到的物品或者更愿意邮寄订购或者选择网络。
If you are looking forward to buy a dog, you should first consider their price factor in order to ensure that you arepaying the right price for your pet and not getting cheated by any chance.
如果你想买狗的话，首先需考虑它们的价格因素以确保价钱合理而不被欺骗。

They do not know when this unlockable phone will come out, but you can be sure the release has been timed (read: delayed) to make sure that everyone has a chance to buy a locked model first in order to protect the carriers.
FORBES: Wireless Carrier Lock-In, iPhone 5 Edition
Here is how Island works: When a broker or trader who uses Island places a buy order, it is routed first to Island to check for matches.
FORBES: Guerrillas on Wall Street