og 208 & 210

iamf

Teratomas are unusual forms of cancer [U]in that they are composed of tissues such as tooth and bone, tissues[/U] not normally found in the organ in which the tumor appears.

上面的句子，连续用了两个tissue，如果改成下面的样子会不会对呢？
Teratomas are unusual forms of cancer [U]in that composed of tissues such as tooth and bone which are not normally found in the organ in which the tumor appears.

210.Scientists have recently discovered what could be the largest and oldest living organism on Earch,a giant fungus that is an interwoen filigreee of mushrooms and rootlike tenteacles spawned by a single fertilized spre some 10k years ago and [U]extending [/U]for more than 30 acres in the soil of Michigan forest.

源解释说extending和spawned很好的并列！不懂，不知道怎么样理解？

请大虾们指教～

princess

1.你的改法有问题
因为in that 引导的原因状语从句中缺少了主语
索性把in that去掉到也对了
Teratomas are unusual forms of cancer [U]in that composed of tissues such as tooth and bone that (which) are not normally found in the organ in which the tumor appears.

2.因为extending和spawned都是用来修饰filigree的，在成分上（非具体形式）对称

iamf

不好意思，改动的句子少了两个单词：Teratomas are unusual forms of cancer in that they are composed of tissues such as tooth and bone which are not normally found in the organ in which the tumor appears.

这样对不？

princess

语法上讲起来没有问题的啦
不过你觉不觉得这样从句里套从句的，没有原句来得清晰？

体会一下哦^^

iamf

倒是，这里犯了重复冗长的毛病，不过原句冒出来两个tissues也让人觉得怪怪的

chnp

2.因为extending和spawned都是用来修饰filigree的，在成分上（非具体形式）对称
我觉得原解释很道理，因为extended可能被误认为过去时还使原句意思混淆。而且新东方老师说对称只有是分词对分词就是形式上对称了。

tigercat

spawned by a single fertilized spre some 10k years ago and extending for more than 30 acres in the soil of Michigan forest.
两个动词表达的时间意思不一样，前一个有10k years ago ，表过去
而后一个表示一直到现在也是这样，所以用现在分词。如果改成过去分词的话，就表示过去是而现在已经不是extend for more than 30 acres in the soil of Michigan forest.

tongxun

而且过去分词有被动的意思，现在分词是自己发出的主动的意思。

vin0410

…be done…and doing…
这种对称og中已出现数次,
每每乍看之下, 都有点犹豫