Don't swim against the current.
不要逆流而游。
She had to swim against the current.
她必须逆著水流往上游。
And what's more, there is current in the sea, obviously it is harder to swim against the current or waves at least.
另外，海里有海浪，很显然，至少逆着海浪游泳更困难。
Plankton is essentially anything living in water that is too small to swim against the current, including krill and algae.
浮游生物是生活在水中的一切，包括磷虾和藻类，它们小到不能逆流而行。
Plankton is essentially anything living in water that is too small to swim against the current, including krill and algae.
浮游生物是生活在水中的一切，包括磷虾和藻类，它们小到不能逆流而行。
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