The phrase "it is expressed" is correct and can be used in written English. It can be used to refer to an idea, opinion, emotion, or feeling being expressed in words or through actions. For example: She had no words to express her sadness, but the tears in her eyes expressed it clearly.
It is expressed in the highest occurrences of its component trinucleotides in respective N-gram tables.
It is expressed by her decision to quit the Lords.
Needless to say, that's not quite how it is expressed.
It is expressed matter-of-factly, without a shred of smugness or superiority, almost with embarrassment.
If Ms. Sills's love is still strong, it is expressed quietly.
It is expressed by (4).
It is expressed as (11).
When I feel like I can't trust my brain 100%, Ludwig really comes in handy. It makes me translate and proofread faster and my output more reliable.
Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu