It's too tight across the back.

背部太紧。

《牛津词典》

He gave the donkey a whack across the back with his stick.

他用棍子在驴背上狠狠打了一下。

《柯林斯英汉双解大词典》

He lashed the horse across the back with his whip.

他用鞭子抽打马背。

《新英汉大辞典》

She made speeches about flying. And she continued to fly by herself across the United States and back.

VOA: special.2010.05.26

That's the finger thing from left finger to right finger going back and forth across the board, never touching a number more than once.

在合并时，我的左手手指,和右手手指来回地在黑板上移动，但对每个数字只会碰到一次。

哈佛公开课 - 计算机科学课程节选

N But it's definitely not one and in fact it wasn't N in the case of Selection Sort because remember the algorithm we implemented on stage last week had me going back and forth across the stage selecting on iteration, the smallest person I can find, the smallest number and then putting them into place.

但在选择排序中，肯定不会是1，也不是,注意，上周我们在这儿,实现的算法中，反复地,迭代进行选择，选出最小的数,然后将其放在合适的位置。

哈佛公开课 - 计算机科学课程节选

Across the back runs a slightly polished metal band, the lone bit of stylistic indulgence here.

ENGADGET: Amazon Kindle Fire HD review (7-inch)

Exemptions do apply, such as if the car is not big enough to accommodate three seats across the back, then two will be sufficient.

BBC: Three children in car seats

The Tunisian side made their intentions of settling for a draw clear by stringing five players across the back, inviting Enyimba to come at them.

BBC: SPORT | Football | African | Esperance hold Enyimba