1.
In this paper, the eigenvalues of the normalized Laplacian and the toughness of graphs are studied and the relation of inequality between of them is given.
研究了图的正规拉普拉斯矩阵特征值与图的坚韧度，并给出了它们之间的不等式关系。
2.
It is strong, light and cheap.
它坚韧、轻便、便宜；
3.
To make or become tough.
使坚强使或变得坚强、强硬、强壮、坚韧
4.
West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood.
西印度灌木或小树，有坚韧的圆滑的叶子和特别硬的木头。
5.
Such power of persevering devoted labor as Mr. Casaubon's is not common
卡苏朋先生那种孜孜不倦，坚韧不拔的工作态度并不多见。
6.
This experience will toughen her.
这次经历会让他变坚韧。
7.
This material is as tough as leather.
这料子像皮革般坚韧。
8.
of a consistency requiring chewing.
指需要咀嚼的坚韧性。
9.
Wiry and agile.
柔韧的坚硬且灵活的
10.
a tough all-weather faBric.
一种坚韧的全天候织物
11.
Every 2-tough graph is fractionally Hamiltonian
2-坚韧图是分数Hamiltonian
12.
strong woody fibers obtained especially from the phloem of from various plants.
尤指来自植物韧皮的坚韧的木质纤维。
13.
Made of or as flexible as withes; tough.
柳条般柔韧的柳条作的，柳条般灵活的；坚韧的
14.
After the rubber its connection intensity is bigger than lumber itself, the cellophane tenacious not embrittlement, the green environmental protection also does not have the corrosion, the waterproof performance is high.
胶后其接口处强度大于木材本身，胶膜坚韧不脆裂，绿色环保且无腐蚀、水性能高。
15.
Mexican or West Indian plant with large fleshy leaves yielding a stiff fiber used in e.g. rope.
墨西哥或西印度群岛的一种植物，具有大而多肉的叶子；结坚韧的纤维，用于制作绳索之类。
16.
Pesistent people begin their success where others end in failure.
坚韧的人从别人的失败中迈向成功。
17.
source of a tough elastic wood.
一种坚硬而富有韧性的木材。
18.
strong lightweight wood of the balsa tree used especially for floats.
轻而坚韧的轻木木料，用于制筏。