This transformation of the jaw structure encouraged fine muscles to develop which, among other things, enabled subtler movement of the tongue, necessary for varied range of sounds used in speech.
여기서 which 앞에 콤마가 있어야 하는 것 아닌가요? necessary는 어디에 연결되는지도 궁금합니다.
People were held responsible for keeping control of their emotion.
이 문장에서 held를 빼도 문장이 성립할까요?
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