我心里越来越不安，最后我给祖母写了封信，把这件事告诉她。
I grew more and more disturbed. Finally I wrote my grandmother about it.
“好几次我的心因为沉重的渴望而越跳越缓，几乎停止跳动。”曼德拉在一封信中写到。
"There are times when my heart almost stops beating, slowed down by heavy loads of longing." one of Mandela's letters reads.
达尔其油田深湖环境有机质类型比较好，成熟度比较高，由于断层封隔性比较强，距离洼陷越近，油源越充足。
In the deep lake sedimentary environment, the oil source is adequate with higher maturity and better type of organic matter near the concave because of the high seal of faults.
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