This is a handy little safety box.
这一只使的小保险箱。
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But many buttons have a useful, practical purpose in everyday life, like calling a lift - so these buttons have to be easy to use without difficulty.The adjective for this is 'convenient'.These everyday buttons have to be convenient.
但是一些按钮在日常生活中很有用,很实用,就像升降电梯,所以些按钮一定要使用方便无困难。个形容词是" 便利" 。些日常生活中按钮必须要便利。