Not to be left behind are the disease-spreading pests, about 100 species of which have become immune to a variety of insecticides now in use.

传播疾病的害虫也不甘落后，其中约有100种对目前使用的各种杀虫剂有了免疫力。

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We're going to be left behind by the rest of the world.

我们就要落后于世界的其他地区了。

《柯林斯英汉双解大词典》

Every student studied hard in order not to be left behind by other students.

为了不落后于其他同学，每个学生都努力学习。

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Down he came,very slowly. Soon,both men were busy placing experiments to be left behind on the moon.

VOA: special.2009.07.15

He says particular care must be given to the thousands of children who were left behind, many of whom have become traumatized by the events.

VOA: standard.2009.09.25

"And once we emerge from the immediate crisis, the long-term economic gains to communities that have been left behind in the digital age will be immeasurable."

VOA: standard.2010.07.02

If anything, it may spur more buying as investors do not want to be left behind.

FORBES: Gold and the China Factor

"The image of the city was once something to be left behind, " said Leinberger.

CNN: Is America's suburban dream collapsing into a nightmare?

They may have to move a lot faster if they are not to be left behind.

ECONOMIST: We will always have Paris