It is rarely clear who is attacking whom.

很难弄清楚是谁攻击谁。

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Not so. Nor is it clear how the transplanted immune cells stop the existing ones from attacking the new organ.

不仅如此，被移植的免疫细胞是如何阻止现有的免疫细胞去攻击新的器官的机理也尚不明朗。

youdao

Misses in clear water could mean the fish are seeing the bait too well and aren't attacking aggressively. A change in skirt colors could make a difference, too.

清水中错过的咬口以为着鱼对饵看得太清楚，攻击并不强烈。这时候改变一下胶裙的颜色，可以有不同的结果。

youdao

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