principally
Cheetahs are mainly found in Africa.猎豹主要生活在非洲。
Helicopters are mainly used for military rather than civil use.直升机主要用于军事而非民用。
It's a disease which affects mainly older people.
Air is composed mainly of nitrogen and oxygen.空气主要由氮和氧构成。
The class is comprised mainly of Italian and French students.

SMART Vocabulary: related words and phrases

Very important or urgent
all-important
at all costsidiom
be a matter of life and/or deathidiom
cardinally
chief
imperative
last
last but not leastidiom
leading
life-altering
life-and-death
overriding
primary
prime
principally
prior
prized
seminal
tectonic
weighty

mainly | American Dictionary

mainly
adverb[ not gradable ]
us/ˈmeɪn·li/
usually, or to a large degree:
The group is mainly made up of young people.

Examples of mainly

mainly
As a supplementary policy, the government permitted pricing based on costs for new health services, mainly high-technology services.
Although it was well-known that rice is mainly self-pollinating, it was also known that some cross-pollination can take place.
The forests are mainly used for extracting reed - a material used both by traditional artisans and the paper-pulp industry.
It gives insight into the format of experts' knowledge structures; experts turn out to use mainly frame representations.
This is mainly due to the paucity of relevant pathological studies.
All these statistical points have been stressed here mainly for methodological reasons, because the numbers studied were relatively small.
Dyslexic students have no vocabulary problems; they mainly have a reading problem.
Not unexpectedly, they tended to report that the correction of linguistic slips is done mainly as they write.
As already stated, transferred rights are mainly exclusion rights.
The present literature review mainly examines involuntary intra- and inter-institutional transfers of older individuals aged 60 and over.
Costs are made during transitions (mainly the fitting of hearing aids).
These sources are mainly of two kinds : verbal and nominal.
They are mainly non-verbal and all three are primarily concerned with the experience of playing.
Indications for surgery were considered appropriate in 59% of cases, uncertain in 32%, and inappropriate in 8%, mainly in the osteoarthritis group.
We refer mainly to vowels in monosyllabic words but extend the discussion to disyllabic words later on.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.