Every January the cost of travelling by train rises, imposing a significant extra burden on those who have no option but to use the rail network to get to work or otherwise.
每年一月，乘火车出行的费用都在上涨，对于那些除了乘坐火车上班之外别无选择的人来说，这给他们带来了巨大的额外负担。
When people train for marathons, a lot of extra endurance training is involved.
当人们打算参加马拉松时，会进行许多超常耐力训练。
You've already come so far; you've paid for the plane ticket, for the train, the hotel, the pizza, the cold drinks, the coffee. How can you now begrudge a few extra cents?
目前你已经来了，机票，火车票，旅馆费，比萨饼，冷饮和咖啡的费用你都支付了，你怎么能会吝啬这区区几个小钱呢？
You can train for it in less time, however, it helps to have a little extra time in case of illness, vacation, or life's chaos.
当然你可以用更少的时间来准备，不过给疾病，假期或者是杂事留点时间是不会错的。
One of two or more vehicles, such as a bus or train, given the same route and schedule, often used to carry extra passengers.
加班车：有相同的路线和行程的两辆或多辆交通工具之一，如公共汽车或火车，常用来接运额外乘客。
One of two or more vehicles, such as a bus or train, given the same route and schedule, often used to carry extra passengers.
有相同的路线和行程的两辆或多辆交通工具之一，如公共汽车或火车，常用来接运额外乘客。
Some think that all the extra dust, dander and bacteria train a baby's immune system, stopping it from reacting unnecessarily.
研究人员对此仍意见不一。有人认为宠物身上的灰尘、皮屑、细菌都会让婴儿的免疫系统产生反应，阻止不必要的反应。
Some think that all the extra dust, dander and bacteria train a baby's immune system, stopping it from reacting unnecessarily.
研究人员对此仍意见不一。有人认为宠物身上的灰尘、皮屑、细菌都会让婴儿的免疫系统产生反应，阻止不必要的反应。
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