让自己长时间聚精会神是很困难的。
It is difficult to make oneself concentrate for long periods.
仔细想来，当时处境是很困难的。
手工收集这些物种是很困难的。
训练鸽子通过叼啄来脱离某种情境是很困难的。
It is difficult to train pigeons to escape from a certain situation by pecking.
“这是一种很困难的情形。”水鼠兰特沉思着说。
"It's a very difficult situation," said the Rat, reflecting deeply.
跟上迅速的变化是很困难的。
寻找他会不会很困难的，或者耗时长呢？
以前，要养活世界最多的人口是很困难的。
It was difficult to feed the largest population in the past.
事实上，给一个女孩买一个不是粉红色的玩具是很困难的。
In fact, it is difficult to buy a toy for a girl that is not pink.
在大风浪中为船舶引航是很困难的。
克服睡意是很困难的。
要我们美国人改变是很困难的。
这是一种很困难的学习方法。
突然告诉公众‘肥即丑’是很困难的。
It is very difficult to suddenly say large is not beautiful.
我告诉过你很困难的。
打破这些变化的束缚是很困难的。
长官，我做了一个很困难的决定。
在嘈杂中胜出是一件很困难的事情。
但是这种清理办法是很困难的。
要比较两个有着如此显著差别的人是很困难的。
It is hard to compare two people who have such striking diferences.
发现不出这样的因果关系是很困难的。
卡波特在小镇上的头几天是很困难的。
这是因为当时将寿险卖出去是很困难的
The idea was that it was difficult to sell people on insurance.
区分不同的亚种是很困难的。
Subspecies are often difficult to distinguish from one another.
强迫别人用您的方式做事情是很困难的。
It is very difficult to force somebody to do things your way.
笑话是一个很困难的领域。
保障系统安全是很困难的。
量化这些新技术对就业的影响是很困难的。
Quantifying the employment impact of these new technologies is difficult.
然而直接探测其它恒星的磁场是很困难的。
Directly detecting the magnetic fields of other stars, however, can be difficult.
然而直接探测其它恒星的磁场是很困难的。
Directly detecting the magnetic fields of other stars, however, can be difficult.
应用推荐