He will be difficult to replace when he leaves.
他离开后，他的位置很难有人接替。
But there are other aspects of his role that do not get as much attention and may be more difficult to replace.
但是对于他的角色，仍然存在许多我们不曾关注的方面，可能这才是最难以被取代的。
That can be a handy trade off, especially for lamps used in places where they are difficult to replace-eg, in chandeliers hanging from high ceilings.
这是一种简便的平衡，尤其对于那些安装在难以更换地方的灯泡——比如枝形吊灯里的灯泡。
Sodium is in every food category, and it is more difficult to replace than the partly hydrogenated oil that composes trans fats, or than sugars, because there are easy substitutes for oils and sugars.
每种食物中都含有钠，要替代钠比替代含有反式脂肪的部分氢化油和糖要困难得多，因为找到油和糖的替代品十分简单。
I think everyone has got more responsibility because it's difficult to replace a player of the calibre of John Terry.
我想每个人都有更多的责任，因为特里很难取代。
It could be a chance for somebody to really make a name. It's difficult to replace a player of Torres's quality but now we will see if they have the character.
这可能是另外的人成名的机会，替代托雷斯这样有实力的球员确实非常难，但是现在我们看重他们是否有斗志。
Because the size of a sensor node is generally small, the battery power is very limited, while the nodes are usually deployed in broad areas, and it is difficult to replace the batteries.
因为传感器节点一般比较小，利用能源非常有限的电池供电，而节点又通常在广阔的环境下部署，难以更换。
Because the size of a sensor node is generally small, the battery power is very limited, while the nodes are usually deployed in broad areas, and it is difficult to replace the batteries.
因为传感器节点一般比较小，利用能源非常有限的电池供电，而节点又通常在广阔的环境下部署，难以更换。
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