Emergency cooling systems could fail and a reactor meltdown could occur.
紧急冷却系统有可能失灵，核反应堆有可能发生堆芯熔毁。
《柯林斯高阶英汉双解学习词典》
By noticing these changes, the woman can tell when ovulation is about to occur.
女性通过留心这些变化就能判断排卵的日期。
《柯林斯高阶英汉双解学习词典》
Ulcers occur when the stomach's natural acids eat into the lining of the stomach.
胃酸侵蚀胃内壁引发溃疡。
《柯林斯高阶英汉双解学习词典》
毫无疑问,利他主义存在于任何社会,而且道德准也普遍提倡利他主义或善良行为,而谴责自私自利.这也正是利他主义具有强大生命力的原因.
《简明英汉词典》
Unless you respect other people's religions, horrible mistakes and conflict will occur.
如果不尊重别人的宗教信仰，就会祷下大错，酿成冲突。
《柯林斯高阶英汉双解学习词典》
一年中有三个假期, 即圣诞节两周, 复活节十天以及通常的两个月暑假.
《简明英汉词典》
I have known dramatic changes occur in the space of a few minutes with this method.
我知道用这种方法短短几分钟之内就能够产生急剧的变化。
《柯林斯高阶英汉双解学习词典》
一个国家的革命只有在内部与外部条件成熟时才能发生.
《简明英汉词典》
If any bright thoughts occur to you pass them straight to me. Have you got any?
你有什么高见就立马告诉我。现在有吗？
《柯林斯高阶英汉双解学习词典》
Changes in temperature occur slowly and are constrained within relatively tight bounds.
温度变化缓慢，而且局限在相对较小的范围内。
《柯林斯高阶英汉双解学习词典》
When vacancies occur, the office puts out feelers to the universities.
有空缺职位的时候，办事处就到各个大学去打探。
《柯林斯高阶英汉双解学习词典》
If these drugs are stopped abruptly then some withdrawal symptoms may occur.
如果突然停服这些药，则可能出现一些戒断症状。
《柯林斯高阶英汉双解学习词典》
