Most record challengers submit their bids for free online .

大部分的记录挑战者都是在线免费提交自己的挑战申请。

The challengers can surely use the same tools .

挑战者们肯定也会采用这些手段。

Second , attack challengers on their home turf .

其次，在挑战者的本土市场发起攻势。

He left the summer to the challengers .

他把这个夏天留给了挑战者。

Challengers are already finding it difficult to replicate that success quickly .

挑战者已经发现，这种成功是很难迅速复制的。