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1. equation noun
原句: They can all be described by the same equations.
意思: a statement showing that two amounts or values are equal, for example 2x + y = 54
字源: late Middle English: from Latin aequatio(n-), from aequare ‘make equal’, from aequus ‘even, level, equal’.
例句: This can be shown by a simple equation.
2. graffiti noun [uncountable]
原句: Other marks look like contemporary graffiti.
意思: drawings or writing on a wall, etc. in a public place
字源: mid 19th cent.: from Italian (plural), from graffio ‘a scratch’.
例句: The subway was covered in graffiti.
3. diagnose verb
原句: Or diagnose when the heart is no longer performing efficiently.
意思: to say exactly what an illness or the cause of a problem is
字源: mid 19th cent.: back-formation from diagnosis.
例句: Her condition was wrongly diagnosed by the doctor.
4. propulsion noun [uncountable]
原句: People thought of jellyfish swimming as like jet propulsion.
意思: the force that drives sth forward
字源: early 17th cent. (in the sense ‘expulsion’): from medieval Latin propulsio(n-), from Latin propellere ‘drive before (oneself)’.
例句: The fish uses its tail fins for propulsion through the water.
5. subtle adjective
原句: But it's a bit more subtle than that.
意思: not very noticeable or obvious
字源: Middle English (also in the sense ‘not easily understood’): from Old French sotil, from Latin subtilis.
例句: There are subtle differences between the two versions.