相关单词：previously
previously解释：adv.以前，先前（地）
previously例句：
The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
Let me digress for a moment and explain what had happened previously.让我岔开一会儿，解释原先发生了什么。
相关单词：pastry
pastry解释：n.油酥面团，酥皮糕点
pastry例句：
The cook pricked a few holes in the pastry.厨师在馅饼上戳了几个洞。
The pastry crust was always underdone.馅饼的壳皮常常烤得不透。
相关单词：alleviate
alleviate解释：v.减轻，缓和，缓解(痛苦等)
alleviate例句：
The doctor gave her an injection to alleviate the pain.医生给她注射以减轻疼痛。
Nothing could alleviate his distress.什么都不能减轻他的痛苦。
相关单词：molecules
molecules解释：分子( molecule的名词复数 )
molecules例句：
The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里，大分子裂变为小分子。
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