名词
中文翻译：如果信号
同义词：
['if condition', 'if clause', 'if conditional']
例句：
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1.If the weather is good, we will go hiking.
如果天气好，我们将去远足。
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2.If you are not ready, we can't start the project.
如果你还没准备好，我们不能开始这个项目。
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3. If he doesn't come, I will call the police.
如果他不来，我会报警。