1、When these side effectsoccur, they are called adverse reactions.(當(dāng)這些副作用發(fā)生時，它們被稱為不良反應(yīng)。)
2、Rattlesnakesoccur in the warmer, drier parts of North America.(響尾蛇出現(xiàn)在北美溫暖干燥的地區(qū)。)
3、When exactly did the incidentoccur?(這一事件究竟是什么時候發(fā)生的？)
4、Does it look like something that mightoccur in nature?(它看起來像自然界中可能發(fā)生的事情嗎？)
5、Most volcanoesoccur at plate boundaries.(大多數(shù)火山的爆發(fā)發(fā)生在板塊邊界。)
6、If Dollo's law is right, atavisms shouldoccur only very rarely.(如果多洛定律是正確的，返祖現(xiàn)象應(yīng)該很少發(fā)生。) (好工具h(yuǎn)ao86.com)
7、These snails do notoccur on low-lying coral islands.(這些蝸牛不會出現(xiàn)在低洼的珊瑚島上。)
8、They're more likely tooccur in societies that frown on divorce.(這種關(guān)系更可能存在于反對離婚的社會中。)
9、Additional breathing changesoccur during REM sleep that are even more dramatic than the changes thatoccur during NREM.(在快速眼動睡眠期發(fā)生的額外的呼吸變化，甚至比那些在非快速眼動期發(fā)生的變化還要顯著。)
10、Such eventsoccur only when the external conditions are favourable.(此類事件只有當(dāng)外界條件有利時才會發(fā)生。)
11、Within a half-mile from ground zero, death from radiation poisoning willoccur within twelve hours.(在核爆點半英里內(nèi)，輻射中毒引起的死亡會在十二小時內(nèi)發(fā)生。)
12、Very rarely did any violent crimes actuallyoccur.(暴力犯罪實際上很少發(fā)生。)
13、Where did the shark attacksoccur recently?(最近的鯊魚襲擊發(fā)生在哪里？)
14、Earthquakes can and dooccur at all depths to about 460 miles.(地震在460英里深度的地方都有可能發(fā)生，也確實會發(fā)生。)
15、Frosts oftenoccur in November.(11月份經(jīng)常出現(xiàn)霜凍。)
16、It didn'toccur to her to ask for help.(她沒想到請別人幫忙。)
17、Ulcersoccur when the stomach's natural acids eat into the lining of the stomach.(胃酸腐蝕胃壁時，就出現(xiàn)了潰瘍。)
18、How can volcanic activityoccur so far from a plate boundary?(火山活動是如何在離板塊邊界那么遠(yuǎn)的地方發(fā)生的呢？)
19、Bombings and shootingsoccur almost daily in Thailand's three southernmost provinces.(在泰國最南部的三個省份，爆炸和槍擊事件幾乎每天都在發(fā)生。)
20、Where does extreme povertyoccur?(極端貧困出現(xiàn)在哪里？)
21、Nitrates are chemicals thatoccur naturally in water and the soil.(硝酸鹽是水和土壤里天然存在的化學(xué)物質(zhì)。)
22、Scientists warned that emergency cooling systems could fail and a reactor meltdown couldoccur.(科學(xué)家們警告說緊急冷卻系統(tǒng)可能失靈，核反應(yīng)堆的堆芯熔毀可能會發(fā)生。)
23、Mind it doesn'toccur again!(小心別再發(fā)生這種事了！)
24、The time when a solar eclipse willoccur can be calculated.(日食發(fā)生的時間可以推算出來。)
25、Why did the near extinction and migrations of wild animalsoccur?(為什么會發(fā)生野生動物瀕臨滅絕和遷徙的現(xiàn)象？)
26、If the climate gets drier, then the logical conclusion is that even more drought willoccur.(如果氣候變得更干燥，那么符合邏輯的結(jié)論就是甚至更多的旱災(zāi)將會發(fā)生。)
27、The coughing with asthma canoccur during the day or at night.(哮喘咳嗽可發(fā)生在白天或晚上。)
28、No one has suggested how this mightoccur.(沒有人提議過這事如何開始。)
29、If headaches onlyoccur at night, lack of fresh air and oxygen is often the cause.(如果頭痛只發(fā)生在晚上，缺少新鮮空氣和氧氣常常是其原因。)
30、Extreme events, however, will continue tooccur.(然而，極端事件將繼續(xù)發(fā)生。)
