Heavy back-up roll fractures spontaneously when it is placed.

大型支承辊在放置时自然断裂。

youdao

The results showed that the higher internal stress and serious carbide network in the banded carbide in the inner roll body were the main causes of heavy back-up roll stationary cracking.

结果表明，辊身心部较高的内应力和在带状碳化物中存在严重的网状碳化物是造成大型支承辊置裂的主要原因。

youdao

Two weeks ago, on a hot summer afternoon, I was about to cross a little busy road when I noticed an old grandpa with a heavy bag on his back just a few meters from me.

两周前，一个炎热的夏天的下午，我正要穿过一条有点繁忙的马路，这时我注意到一位背着一个沉重的包的老爷爷就在离我几米远的地方。

youdao

The heavy pack on his back let him think of what he would do when he got home.

VOA: special.2010.06.26

So, held back here the heavy artillery.

那么,藏在后面的是重炮

耶鲁公开课 - 聆听音乐课程节选

one of the soldiers said to Smith. "You'll never be able to walk all those miles with that heavy pack on your back."

VOA: special.2009.12.12

The big goal is to push all the heavy back-end work forward to front-line workers, often as a "dashboard" on a handheld device.

WSJ: Data Analytics: So, What's Your Algorithm?

Think of an eccentric muscle movement as gradually lowering that heavy object back down.

FORBES: Be (Financially) Eccentric

This is what this data is supposed to monitor, but the well flow evidence would appear to have been ignored, because at this point the BP rig supervisors should have gone to a well kill operation and started to pump heavy mud back into the well bore to restore the primary control mechanism.

WSJ: The Oil Disaster Is About Human, Not System, Failure