SelectionListener 实现的构造函数接受一个布尔变量，该变量定义要展开还是折叠树项目，具体取决于选中了哪个按钮。
The constructor for the SelectionListener implementation accepts a Boolean variable that defines whether the tree items are to be expanded or collapsed, depending on which button is selected.
丘吉尔在奥尔德姆选区的补选中以微弱差距落败，此后回归新闻记者的行列，在1899年至1902年的第二次布尔战争中，他担任《晨报》驻南非的战地记者。
After narrowly losing a by-election in Oldham, he returned to the journalistic fray as a war correspondent in South Africa for the Morning Post during the second Boer war of 1899-1902.
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