With today's more efficient contraception women can plan their families and careers.

如今有了更为高效的避孕方法，女性们可以规划自己的家庭和事业。

Technological advances allow more efficient use of labour.

科技的进步使劳力使用更高效。

an efficient way of testing thousands of compounds.

能测试上千种化合物的高效方法。