强机制、强品牌、强渠道的三重壁垒，使后入局者必须在疗效、安全性或特定人群定位上实现显著差异化。
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But those enticed by the call of adventure must ensure they know what they're signing up for. Fresh food is scarce and alcohol is limited. And accommodation at BAS facilities is shared dormitories. Staff work a seven-day shift rota.