2 Requirement The underlined part in each sentence must be expressed by a prepositional phrase. 1、在这些(式子)中,只有式(12-5)会引起问题。 2、在我们讨论这一课题时,我们将注意力限于其基本原理上。 3、一旦加上合适的控制信号后,该触发器(nip-fop)就将改变 储存的信息。 Of these equations, only Eg 12.5 will cause problems In our discussion of this subiect, we shall restrict our attention to its basic principles. Upon the application ofproper control signal, the flip-flop will change the stored information[2] Requirement :The underlined part in each sentence must be expressed by a prepositional phrase. 1、在这些（式子）中，只有式（12－5）会引起问题。 2、在我们讨论这一课题时，我们将注意力限于其基本原理上。 3、一旦加上合适的控制信号后，该触发器（flip-flop）就将改变 储存的信息。 Of these equations, only Eq. 12.5 will cause problems. In our discussion of this subject, we shall restrict our attention to its basic principles. Upon the application of proper control signal, the flip-flop will change the stored information