1.When in doubt, parenthesize expressions to force the grouping that the logic of your program requires.

1.如果有怀疑，则在表达式上按程序逻辑要求使用强制操作数的组合。

2.The new grouping of classes means larger numbers in each class.

2.这次重新编班，意味着每个班的人数增多了。

3.Educators try to put pupils of similar abilities into classes because they believe that this homogeneous grouping is advisable.

3.育学家设法将学生按相近的能力分班,因为他们认为这种按同划分班级的做法是明智的。

4.The result shows that the cleat density in coal bed varies in different microlithotype,and the occurrence of cleat is relevant to the grouping sequence of microlithotypes.

4.结果表明,裂隙在不同显微煤岩类型煤体中的分布存在较大的差异,同时裂隙分布的位置与显微煤岩类型的组合序列有关。