That may make it tempting to fire off as many messages as quickly as possible and hope for the best.

这可能会让人忍不住想尽可能快地发送更多消息，然后希望一切顺利。

On one campus, students use Wi-Fi to fire off instant messages, review their homework assignments, and check their bank balances.

有一所大学里，学生用无线网络发送即时信息、复习家庭作业以及查看银行账户余额。

Excitatory neurotransmitters depolarize the postsynaptic neuron by making the inside of it more positive and bringing it closer to its action potential threshold, making it more likely to fire that message on to the next neuron.

兴奋性神经递质通过使突触后神经元内部更加积极并使其更接近其动作电位阈值来去极化突触后神经元，使其更有可能将该信息发送到下一个神经元。