To further secure the system, tokens only can be used once.
为了进一步加强系统的安全，令牌只能被使用一次。
Often a variable is only assigned to once and is used as an (immutable) definition.
通常对变量的赋值只有一次，并被当作不变的对象。
Tom's second computer went wrong although he used it only once.
汤姆的第二台电脑出毛病了，尽管他只用了一次。
I used to read every day. Now I only read once a week.
我以前每天看书，现在一个礼拜才看一次。
Mutually exclusive (ME): Is each point used only once and in the best place?
相互之间具有排他性：每一个论点是否只用一次并用在最适当的位置？
I'm only left with used-to-be's and once upon a song.
我被遗弃在我们曾经唱过的歌里。
I'm only left with used-to-be's and once upon a song.
我被遗弃在我们曾经唱过的歌里。
应用推荐