We realized the main barrier to entry is going to be scale.

我们意识到，规模是敲开市场的主要壁垒。

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The cell membrane is the main barrier for the macromolecules entering into a cell.

细胞膜是细胞外大分子进入细胞的主要屏障。

youdao

Vascular endothelium cells are the main barrier which constitutes the vasopermeability.

血管内皮细胞是构成血管通透的主要屏障。

youdao

The main barrier to further black empowerment is the question of who ultimately pays for change.

ECONOMIST: Black empowerment in South Africa

But they all agree that the main barrier to growth is the scarcity of investment.

ECONOMIST: London's high-tech start-ups

Representatives from Caerphilly County Council told the committee that the lack of secure funding year on year is the main barrier to effective delivery of biodiversity action.

BBC: Sustainability committee