Introduce the new concepts of weak domain, weak principal ideal ring and weak Euclidean ring.

引进了弱整环、弱主理想环、弱欧氏环等概念，研究了环的直和保持的一些性质。

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After counseling numerous troubled marriages, I have observed that distressed marriages frequently are weak in the domain of repentance and short on apologies.

在众多婚姻问题的咨询中，我观察到痛苦的婚姻经常是悔改的心和简短道歉软弱的领域。

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Both on time domain and frequency domain, the detection for lifetime of weak fluorescence signal is studied.

在时域和频域上进行了微弱荧光信号的寿命检测的研究。

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