人们已经开始努力确定使用昆虫作为生物控制手段的可行性，但仍认为有效的生物控制手段还需要数年时间。
Work has begun to determine the feasibility of using insects as biological controls, but effective biological controls are considered years away.
这显然是麦当劳限制供应其广受欢迎的 McRib 的原因——这一营销手段让猪肉三明治成为人们痴迷的产品。
This is apparently the reason McDonald's restricts the availability of its popular McRib—a marketing trick that has turned the pork sandwich into an object of obsession.
网络学习已日益成为人们获取知识和解决问题的重要手段。
Network learning has increasingly become an important means for people to acquire knowledge and solve problems.
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