This is referred to as "the struggle for existence".
这通常称为“生存竞争”。
Most animals have to struggle for existence in a dangerous world.
在一个充满危险的世界里，动物不得不为了生存而斗争。
Most animals have to struggle for existence in a dangerous world.
大多数动物得在一个充满危险的世界上为生存而竞争。
Those colonists had to struggle hard for existence.
那些殖民者必须为生存而艰苦奋斗。
We shall not have to struggle for our daily existence as we do now.
我们将不会有我们的日常斗争的存在，因为我们现在要做的。
We shall not have to struggle for our daily existence as we do now.
我们将不会有我们的日常斗争的存在，因为我们现在要做的。
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