They used special microfibers, rather than coarse bits of gravel and sand, to strengthen the cement.

他们用特殊的超细纤维来替代粗糙的砂石颗粒，以强化水泥。

youdao

Both sides can also strengthen cooperation in the areas of tourism, sand storm prevention and space technology.

双方还可在旅游、防治沙尘暴、空间技术等领域加强合作。

youdao

The soft soil and sand foundation consolidated by vibration and impaction stone column can strengthen earthquake - resistant stability, raise bearing capacity and reduce settlement.

应用振冲碎石桩加固软土地基和砂基地，可增强抗震稳定性，提高承载力和减少沉降量。

youdao

One thing is certain, though - after In Amenas, the Algerian government will strengthen its security apparatus in the Sahara, as beneath its sand lies much of Algeria's wealth.

BBC: In Amenas siege: Is Algeria's economy under threat?