On average, students have to spend 3 hours finishing homework every day, but if we are stuck by difficult questions, the time will be extended.
学生平均每天要花三个小时来完成作业，但是如果遇到难题，完成作业的时间就得延长。
Paradoxically, while getting a visa for Iran can be very difficult, once you have one it is normally just a formality to have the time limit extended.
看起来伊朗签证似乎非常困难，但是一旦得到了签证，签证的延期通常只是一个手续问题了。
So far, it has proved difficult to combine proteins from nuts with human proteins, but Saxon believes his method of curing cat allergies can be extended to meet this situation.
迄今为止，经验证，把果仁蛋白与人体蛋白结合十分困难，但撒克逊相信他根治猫过敏的方法能够适用于这一问题。
Dark flow, he said, "would be much more difficult to explain theoretically if it extended [2.5 billion light-years] and then just stopped."
他说，“如果黑暗流延伸[25亿光年]然后戛然而止，那么理论上就更加难以解释。”
It's not difficult to envision that this same approach can be extended to other situations, such as handling common responses for online chat Help Desks.
不难设想，同样的方法可扩展到其他场景中，如用于在线对话HelpDesk处理某些常用反馈信息。
As noted above, it is very difficult to be successful at short-term market timing over an extended period of time.
如上面所说的，短期择时交易要比长期择时交易难的多。
As noted above, it is very difficult to be successful at short-term market timing over an extended period of time.
如上面所说的，短期择时交易要比长期择时交易难的多。
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