| 1. | This retrograde conduction does not always take place .
逆向传导不经常进行。 |
| 2. | The breakdown (and building up) of atp is constant .
三磷酸腺甙的分解（和合成）是经常进行的。 |
| 3. | The enemy will not have strength to repeat such descents often .
敌人没有经常进行这种空降的力量。 |
| 4. | Jastrow and mutterperl carry on long free conversations behind their masks .
杰斯特罗和穆特普尔两人在口罩掩护下经常进行长时间的无拘束的谈话。 |
| 5. | Some students often have a chat on the internet
有些学生经常进行网上聊天。 |
| 6. | We train regularly to keep fit for study and work
我们经常进行锻炼，为学习和工作练好身体。 |
| 7. | Do you often carry out market research
你们经常进行市场研究吗？ |
| 8. | Back up often and keep your backups physically secure
经常进行备份，并将备份存放在安全的场所。 |
| 9. | You should do so early and often
您应尽可能早并经常进行集成。 |
