In natural environment, sound signals often occur with background noise.

In the construction process, engineering changes often occur.

建设项目建设过程中，常会发生工程变更。

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Geological diseases often occur in the civil construction.

地质病害在土建施工中是经常发生的。

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Thus, claims are often occur during construction of a project.

因此，在工程的实施过程中，索赔是经常发生的。

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Hepatitis B, C and D usually occur as a result of parenteral contact with infected body fluids.

发生乙型、丙型和丁型肝炎通常是由于通过非肠道途径接触了受感染的体液。

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They usually occur during stressful moments, such as when a person is in danger.

它们通常出现在压力大的时候，比如说当人处于危险中。

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They usually occur along the boundaries of the thin plates that cover the Earth like an egg shell.

地震一般都在较薄的板块边缘沿线发生，而较薄的板块对地球而言就像鸡蛋壳一样。

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In blasting engineering work, the influence of complicated geological conditions whiCh usually occur on blasting effect comes in many ways.

定向爆破工程中，爆区地质条件往往很复杂，因此对爆破效应的影响也是多方面的。

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Osteoporosis is usually occur concomitantly with arterial calcification in elderly.

众所周知老年患者发生骨质疏松的同时常常伴发血管钙化。

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BACKGROUND: Vascular complications usually occur in diseases related to obesity such as primary hypertension or diabetes.

背景：原发性高血压、糖尿病等肥胖相关性疾病往往出现血管并发症，活血化瘀法治疗肥胖症有一定疗效，据此推测肥胖与血瘀证可能相关。

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Tunnel projects usually occur in city where high-rise building and elevated bridge etc have badly concentrated.

地铁工程建设多滞后修建于高层建筑、高架桥梁等已高度密集的城市环境中。

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Terrible things usually occur at midnight.

可怕的事情通常在午夜发生。

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The mutations usually occur in mucous malignant cancer and the mutation rate is increased significantly.

polβ基因突变多发生在粘膜性恶性肿瘤，并且突变发生频率也相对较高。

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The breakthrough of gas usually occur during low permeability reservoir development, that lead to recovery efficiency fall.

低渗透油藏注气开发极容易发生气窜，导致采收率降低。

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They usually occur in high stakes situations, where people have something to lose or gain.

微表情通常会在人们经历得失、情势危急的时候出现。

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Faulf of electric equipments usually occur in their use.

电气设备使用中经常会出现故障。

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Small precursory events usually occur before strong instability involving the intersecting faults.

涉及交叉断层的较大失稳事件发生前常出现前兆性小事件。

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The events callbacks usually occur at the time of parsing.

事件回调通常在进行解析时发生。

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The respiratory behaviors usually occur when they are in the middle of water.

母仔豚呼吸行为多发生在夹江中心水域。

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These two kinds of lesions usually occur within 3 months after birth.

婴儿湿疹和婴儿脂溢性皮炎好发于出生后3个月以内的婴儿，后者可能是由于母体雄性激素的影响。

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This class of problems usually occur in many scientific and engineering fields.

此类问题时常出现在许多科学与工程的研究领域内。

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