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。
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