Concrete composition and structure are fundamental factors that affect its mechanical properties and durability.
混凝土的组成与结构是制约其力学性能与耐久性能的最为根本的因素。
Comparing with lower grade concrete in early years, a lot of characters have been changed for modern concrete, such as the changes of concrete composition, to solidify early and high intensity, etc.
与以往混凝土标号普遍较低的情况相比，现代混凝土的组分发生了变化，并往往具有早强、高强的特点。
It also details in concrete terms the composition of the three tokens (a plus sign, a minus sign, and an integer) that the parser expects to encounter while scanning through the input stream.
它还详细描述了三个记号(加号、减号和整数)组合的具体项，解析器在扫描整个输入流时希望遇到这些项。
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