The hazardous materials, which are abundant in variety, large in demand, and complex in nature, are difficult to manage with complex transport organization and scrutiny.
铁路危险货物罐车运输品类多、需求量大、性质复杂，具有运输组织难度大、技术管理要求高、安全责任重的特点。
Nowadays many college students prefer to have electives in their spare time because the courses can offer a variety of skills and abundant knowledge apart from what they learn in the daily courses.
现在许多大学生喜欢在他们的空闲时间，因为选修的课程可以提供他们从每天的课程学习的技能和丰富的知识外品种。
Huanggang folk songs embody a rich variety of lining words and tunes, which greatly enrich their expressiveness by the abundant connotation and striking local color contained in them.
黄冈民歌中大量地使用了衬词和衬腔，且衬词衬腔的形式多样，内涵丰富，体现出鲜明的地方色彩，极大地丰富了黄冈民歌的表现力。
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