Singing demands neurological sophistication and physical stamina and is thus a good signal of what fine mates (and bad opponents) they would make.
鸟儿的鸣叫需要复杂的神经系统和良好体力的配合，因而能很好地显示出它们会是多么优秀的配偶（强有力的竞争对手）。
LIKE many people, birds sing to show off. Singing demands neurological sophistication and physical stamina and is thus a good signal of what fine mates (and bad opponents) they would make.
跟很多人一样，鸟用鸣叫来炫耀自己。鸟儿的鸣叫需要复杂的神经系统和良好体力的配合，因而能很好地显示出它们会是多么优秀的配偶(强有力的竞争对手)。
Lack of good study habit, stamina and effective study methods also caused their negative attitude and fear to mathematics.
加上没有形成良好的学习习惯和意志力，没有掌握有效的学习方法，造成对数学望而生畏或无动于衷的消极心态。
Exercising your physical stamina through clear enunciation, loud and clear tones, wide pitch, good breathing methods, proper posture, expressive facial movements and optimistic smiles.
字正腔圆的发音，洪亮的音色，广阔的音域，良好的呼吸方式，有助操练健康的体魄，专业的形体操丰富的表情，乐观的笑容。
Exercising your physical stamina through clear enunciation, loud and clear tones, wide pitch, good breathing methods, proper posture, expressive facial movements and optimistic smiles.
字正腔圆的发音，洪亮的音色，广阔的音域，良好的呼吸方式，有助操练健康的体魄，专业的形体操丰富的表情，乐观的笑容。
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