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It is never difficult to understand the weather forecast unless ambiguous terms are used. |
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Since the weather isn't always clear, it's often difficult to forecast it. |
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It is difficult to forecast the weather in terms which are not ambiguous and are thus understandable. |
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The terms used in weather forecasting are unclear and can not be understood. |
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As much of the wording in weather forecasts isn't clear, it is sometimes difficult to understand them. |