It might also be hard for airlines to co-ordinate the departure times and destinations of passenger aircraft in a way that would allow them to gain from formation flight.
航空公司可能也很难协调客机的起飞时间和目的地，使它们能够从编队飞行中获益。
A topic-based approach can be hard to assess in schools with a typical spread of ability.
在以典型的能力多元化为特征的学校里很难评估一种基于话题的教学方法。
在线学习可能很困难。
Making new friends can be hard too.
结交新朋友也很难。
If you want to be a postman, you should be hard-working.
如果你想做邮递员，你应该要勤劳。
Exercising can be hard but RunKeeper will help you every step of the way.
锻炼可能很难，但运动日志会帮助你做到每一步。
In his introduction, he made it clear that our credits would be hard-earned.
在他的介绍中，他明确表示，我们的学分将会很难取得。
If a rider is too heavy, it will be hard for the motorcycle to take off.
如果骑车人太重，摩托车就很难起飞。
Food safety is another problem: it can be hard to know where the food comes from.
食品安全是另外一个问题：很难知道食品来源。
He didn't want to lose them, but he knew it would be hard for them to stay close.
他不想失去他们，但知道与他们保持亲密关系会很难。
Dogs like Shaynee help patients feel calm and at peace which can be hard in a busy hospital.
像谢尼这样的狗可以帮助病人感到平静和内心平和，通常这一点在医院这种繁忙的环境下是很难做到的。
We form the good habit, which would be hard to break even if we wanted to break it.
我们形成了好习惯，即使我们想要摒弃它也很难。
I do get real speaking roles, but work can be hard to come by if you're not a popular star.
我的确拿到了有台词的角色，但如果不是人气明星，可能很难拿到这份工作。
If the sea animals eat them by mistake, the rubbish will be hard to digest and stay in their stomachs forever.
如果海洋动物不小心吃了它们，垃圾很难被它们消化，会永远留在它们的胃里。
It is also the key to understanding the thoughts and feelings that common people have, which may be hard to express.
它也是理解普通人难以表达的想法和感受的关键。
Her parents thought her life would be hard, but Sarah could live on her salary and still saved $5,000 in a year.
她的父母认为她的生活会很艰难，但莎拉可以靠她的工资生活，而且一年内还能存下5000美元。
These days you'd be hard pressed to find anyone in Australia over the age of 15 who doesn't own a mobile phone. In fact, plenty of younger kids have one in their pocket.
如今，在澳大利亚，你很难找到15岁以上的没有手机的人。事实上，很多更小的孩子口袋里都有一个手机。
With such busy lives, it can be hard to try and find the time to work out.
在如此忙碌的生活中，很难找到时间去锻炼。
Making cakes may take time and be hard work, but Taylor sees the fun in it.
做蛋糕可能需要付出时间和辛劳，但泰勒从中发现了乐趣。
There's digging, weeding and watering. Even picking things can be hard work.
挖土、除草、浇水、甚至摘东西都是很辛苦的工作。
"Very well," he thought, "let them bury it there; it won't be hard to find."
“很好，”他想，“让他们把它埋在那儿吧。这并不难找。”
"No one else to—well, I mustn't be hard on you," said the Rat with forbearance.
“没有别人——好吧，我不能对你要求太高。”水鼠宽宏大量地说。
Touch screen may also be hard to use for people who is not familiar with computers.
对于不熟悉电脑的人来说，触摸屏可能也很难使用。
Born with a silver spoon in her mouth, she was taught by her parents to be hard-working and thrifty.
虽然出生在富贵之家，她的父母却教导她要勤俭节约。
For example, Newman accepts it would be hard for a city as hilly as Auckland to develop a really good rail network.
例如，纽曼承认像奥克兰那样的丘陵城市建设一个良好的铁路网将是很困难的。
Patterns of childhood eating can be hard to break when we're adults, which may mean that kids of depressed moms end up dying younger.
童年的饮食模式在我们成年后很难打破，这也许意味那些有着抑郁的母亲的孩子们最后会早逝。
At the back, students probably won't speak much, but in big classrooms, it can be hard to see the board and hear what the teacher is saying.
坐在后排的学生可能不会讲太多，但在大教室里，可能很难看到黑板，也很难听到老师在说什么。
It can be hard to identify which parcels are carrying crucial items such as Social Security checks, but USPS and UPS try their best to prioritize sensitive material.
虽然很难辨别哪些包裹里装的是社会保障支票等重要物品，但美国邮政（USPS）和联合包裹服务公司（UPS）会尽其所能优先处理敏感材料。
Saving lives in eastern Libya will be hard.
挽救利比亚东部人民并非易事。
Won't it be hard to change my eating habits?
改变吃的习惯会不会很难呢？
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