I'm sure it will work if you can persist.
我相信如果坚持的话一定会有效的。

1 work（机器或设备）运转
The computer doesn't work.I'd better buy a new one.
电脑不工作了。我还是买个新的吧 。
（想法，系统或方法）奏效
My plans finally worked.
我的计划终于奏效了。
If you want to lose weight by dieting.I'm sure it will not work.
如果你想通过节食减肥，我保证不会奏效。
（药物）起作用
The sleeping pill doesn't work for me.
安眠药对我不奏效。
2 persist 坚持
persist in doing坚持做..
He persists in quiting his decent job and traveling on a tight budget.
他坚持放弃相当好的工作，开始穷游。
A:I want to lose some weight!
我要减肥！
B:So do I.
我也是！
A:I have a yoga class tomorrow.Do you want to come with me?
我明天上瑜伽课，一起去吗？
B:No,it's too expensive for me.I've decided to take some exercises on my own.
不了，太贵了。我决定自己做些运动。
A:What are you going to do?
你打算做什么？
B:Run around the track.In the morning I run for an hour,and in the afternoon I run around the building.
去操场上跑步。早上跑一小时，晚上绕大楼跑一圈。
A:Good.I'm sure it will work if you can persist.
不错。我相信如果坚持的话一定会有效的。
B:I hope so.Would you like to join me?
希望如此。你愿意和我一起去吗？
A:Sounds good.
好啊。