Even high-priced commodities like spices had to be transported in large bulk in order to justify the expense and trouble of sailing around the African continent all the way to India and China.
即使像香料这样的高价商品，也必须大量运输，以证明环绕非洲大陆航行到印度和中国的费用和不便是合理的。
2
So, basically, in order to move, a cell climbs hand-over-hand along the extracellular matrix until it reaches a blood or lymphatic vessel and penetrates it. From there, it's smooth sailing.
基本而言，细胞顺着细胞外基质移动，一旦发现血管或淋巴管，穿透血管和淋巴管，这样就畅通无阻了。
3
To turn a sailing ship so that its bow heads into the wind and the ship lies motionless except for drifting, in order to meet a storm.