They defend their territories from other antbirds by singing complex duets to signal their combined strength.
它们通过复杂的鸣声二重奏来显示其合作的强大，以此捍卫领地不受其他蚁鸟的侵犯。
This volume also addresses: intervals, chord voicings, improvisation, rhythm-guitar techniques, play-along duets and more.
本册书也涉及到了音程，和弦声部，即兴演奏，节奏吉他技巧，二重奏等。
By using two kinds of model of ducts in which the VLF electromagnetic waves are guided, we obtain the distributions of magnetic field and current in the whistler duets.
利用两种能够引导甚低频电磁波的导管模式，求得哨声导管中磁场和电流的分布。
By using two kinds of model of ducts in which the VLF electromagnetic waves are guided, we obtain the distributions of magnetic field and current in the whistler duets.
利用两种能够引导甚低频电磁波的导管模式，求得哨声导管中磁场和电流的分布。
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