expression 表示“表达方式；措辞；词句”，是可数名词。
例如：The expressions you use might depend on whom you are speaking to or how well you know them.你采用的表达方式可能取决于我正在和谁或是你对他们的熟悉程度。expression还有作不可数名词“表达；表示”以及可数名词“表情；脸色；声调”等。如：She gave expression to her sadness.她流露出了悲伤之情。There is an expression of happiness on every face.每个人脸上都喜气洋洋。