I think mobile telephones are the most useful device for us in many ways.
However, electronic micro waves like blue light from them are harmful for us.
I read a news that Blue light causes eye dryness, fatigue and even cancer .
So, it's better to use them effectively.
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~~ Teacher Sharon
I think mobile telephones are the most useful device for us in many ways.
>> I think mobile telephones are the most useful devices for us in many ways.
However, electronic micro waves like blue light from them are harmful for us.
>> Correct
I read a news that Blue light causes eye dryness, fatigue and even cancer .
>> I read some news that Blue light causes eye dryness, fatigue and even cancer.
So, it's better to use them effectively.
>> Correct