何时进行交叉训练？
Day 5: Rest, cross-train, or short, easy run.
第5天：休息，交叉训练，或短距离轻松跑。
Monday: Rest, run easy, or cross-train at 70% of Max heart rate.
星期一：休息，轻松跑或交叉训练，70%的最大心率。
For example, if you become injured and can't continue training, you can cross-train instead.
比如如果你受伤无法继续训练，那么你可以用交叉训练来代替。
"So you have to train people to cross boundaries," Mr Ellwood concludes.
Ell wood总结道：“因此，需要训练人们跨界。”
What do you get when you cross a bus with a train?
当遇到一辆带火车的公交车的时候，你会怎么办？
You can cross train, as long as it's pain-free.
你能完成训练，只要疼痛没有造成影响。
Let's cross the railway after the pass of the train.
让我们等火车过了以后再穿过铁路。
Let's cross the railway after the passing of the train.
让我们等火车过了以后再穿过铁路。
我走过火车的铁路平交道口。
我走过火车的铁路平交道口。
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