为……做准备
used to announce the beginning of a race
（赛跑口令）各就各位，预备，跑
Available for immediate use
可立即使用的：立即可以投入使用的
soldiers with machine guns at the ready; students with notebooks at the ready.配备有机枪的士兵们；准备好笔记本的学生们
soldiers with machine guns at the ready; students with notebooks at the ready.
配备有机枪的士兵们；准备好笔记本的学生们
To make preparations.
做准备