Than is used to link two parts of a comparison.
He wished he could have helped her more than he did.
他希望自己当时能更多地帮帮她。
You use than in order to link two parts of a contrast, for example, in order to state a preference.
The arrangement was more a formality than a genuine partnership of two nations.
这种安排与其说是两国间真正的伙伴关系的表现,还不如说是出于礼节。
You use than after a comparative adjective or adverb in order to link two parts of a comparison.
Children learn faster than adults.
孩子比大人学得快。
The radio only weighs a few ounces and is smaller than a pack of cigarettes.
这个收音机只有几盎司重,比一包香烟还小。
You use than when you are stating a number, quantity, or value approximately by saying that it is above or below another number, quantity, or value.
They talked on the phone for more than an hour.
他们在电话里聊了一个多小时。