como norma general

= as a rule of thumb, as a general rule, as a general rule of thumb, as a rough guide

Ex. As a rule of thumb, most major libraries have chosen not to renew their periodical subscriptions.

Ex. As a general rule, you can 'buff up' your look by making your shoulders seem wider and your waist narrower.

Ex. As a general rule of thumb, you want front and side fans to intake, rear and top to exhaust.

Ex. As a rough guide, if you've had severe period pain (known as dysmenorrhoea) since around the time your periods first started, it's less likely a particular cause will be found.

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= as a rule of thumb, as a general rule, as a general rule of thumb, as a rough guide

Ex: As a rule of thumb, most major libraries have chosen not to renew their periodical subscriptions.

Ex: As a general rule, you can 'buff up' your look by making your shoulders seem wider and your waist narrower.

Ex: As a general rule of thumb, you want front and side fans to intake, rear and top to exhaust.

Ex: As a rough guide, if you've had severe period pain (known as dysmenorrhoea) since around the time your periods first started, it's less likely a particular cause will be found.