Southwest sag of Tarim Basin has apparently dissymmetrical structure.是什么意思？

Southwest sag of Tarim Basin has apparently dissymmetrical structure.

塔西南坳陷具有明显的不对称结构.

southwest

n. 西南，西南方，，西南部；adv. 向西南；adj. 西南的，西南部的；

例句
They sped through the American southwest with the law hot on their heels.
他们飞车穿越美国西南部，警察紧追其后。

sag

vi. 下垂，消沉，下跌，[航]漂向下风向；vt. 使…下垂；n. 下垂的动作或事例，下垂度，下沉地带，下

例句
The shirt's cuffs won't sag and lose their shape after washing...
这件衬衫的袖口洗后照样挺括，不变形。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

basin

n. 盆，盆地，流域，水坑，池塘；

例句
...a cast-iron bath with a matching basin and wc.
铸铁浴缸及配套的洗涤槽和马桶

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；

例句
...the operation a patient has had.
病人做过的手术

apparently

adv. 据说，似乎，看来，显然；

例句
He was apparently quite converted from his anarchist views.
显然他基本上完全放弃无政府主义的观点了。

dissymmetrical

adj. 非对称的，不匀称的；

例句
Southwest sag of Tarim Basin has apparently dissymmetrical structure.
塔西南坳陷具有明显的不对称结构.

structure

n. 结构，构造，建筑物，体系；vt. 构成，排列，安排；

例句
Engineers found the structure had been corroded by moisture...
工程师们发现该建筑已经受潮腐蚀。