Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.

已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。

youdao

It was a great relief to be back on dry land after such a rough crossing.

渡过汹涌澎湃的大海回到陆地后使人长舒一口气。

《牛津词典》

This was only the third vehicle crossing of Antarctica in history, and the first to get there and back.

这是历史上仅有的第三次驾驶交通工具的南极穿越，更是第一次往返。

youdao

There was a notable shift in emphasis from the Blues at that point, another Blair run that produced quick possession at the beginning of a move, involving Halfpenny, that ended with the full-back crossing.

BBC: Cardiff Blues 62-20 Calvisano

Hitting the ageing Finns on the counter-attack is what is what Wales had to do and nine minutes before the break, Tottenham left-back Bale did just that crossing from the by-line for Simon Church, but the Reading striker could not direct his glancing header goal-bound.

BBC: Finland 2-1 Wales

Argentina thought they had levelled when Bernardo Stortoni touched down in the corner but the TMO ruled that Paterson's tackle had taken the full-back into touch before crossing the line.

BBC: Argentina 21-15 Scotland