Far strong and near weak: some commodities have a long delivery period and a strong trend. For example, the main soybean contract has been changed from 0909 contract (delivered in September 2009) to1001(delivered in June 2010). This 100 1.

Near strength and far weakness: some commodities have a short delivery period and the trend is still relatively strong. For example, the main contract has just been transferred to 1 week, and the delivery period of fuel oil contract 0906 is very short. It was delivered in June and recently transferred to 0907.

I hope it helps you.