Channels aren't the only available option for synchronization between processes, nor are they always the most appropriate.
通道不是进程间同步的惟一可用选择，也不总是最合适的选择。
There are still many areas where animal testing is necessary and non-animal testing is not yet a scientifically valid and available option.
目前在许多领域，动物实验仍是必要的，非动物实验还不是一个科学有效和可行的选择。
Nowadays, oil-pollution of seawater in the world has severely threatened the security of sea entironment. Bioremediation offers one available option for an oil spill response.
目前世界海洋石油污染问题已经严重威胁到海洋生态环境的安全，生物修复是一种处理石油污染的新方法。
Nowadays, oil-pollution of seawater in the world has severely threatened the security of sea entironment. Bioremediation offers one available option for an oil spill response.
目前世界海洋石油污染问题已经严重威胁到海洋生态环境的安全，生物修复是一种处理石油污染的新方法。
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