常量

Often means frequently, often. Not a fixed value.

Always means every time, without exception. Not a fixed value, but a fixed frequency.

Variable; a value that can change. This is the direct opposite of '常量'.

Many English speakers confuse '常量' (constant) with '经常' (often) or '总是' (always) because they associate '常' with frequency. However, '常' in '常量' refers to something unchanging or regular, not something that happens frequently.

'常量' refers to a fixed, unchanging value or quantity. '经常' and '总是' refer to the frequency of an action or event.

物理学中，光速是一个常量。 (In physics, the speed of light is a constant.)

Often confused with '总是' (always). While both indicate frequency, '经常' implies something happens often but not necessarily without exception, whereas '总是' implies it happens every time.

'经常' means often, frequently. '总是' means always, without exception.

我经常去图书馆。 (I often go to the library.)

Similar to the confusion with '经常', English speakers sometimes overuse '总是' when '经常' would be more appropriate, leading to an overstatement of regularity.

'总是' means always, implying 100% of the time. '经常' means often, implying a high frequency but not every time.

他总是迟到。 (He is always late.)

Often confused with '一般' (general, common). While they can be similar, '普通' tends to emphasize average or ordinary, whereas '一般' can also mean 'generally speaking' or 'usually'.

'普通' means ordinary, common, average. '一般' can mean generally, usually, or also common/ordinary but with a slightly broader usage.

他是一个很普通的学生。 (He is a very ordinary student.)

As mentioned above, '一般' and '普通' can be confusing. '一般' can also function as an adverb meaning 'generally' or 'usually', which '普通' cannot.

'一般' can describe something as common/ordinary, or it can be an adverb meaning 'generally' or 'usually'. '普通' primarily describes something as common/ordinary.

我一般七点起床。 (I generally get up at seven o'clock.)