Moodiness, which imposes a small cost on the relationship, may function as both an alarm bell and as an assessment device to test the strength of the bond.
情绪多变，会给爱情带来一些小损害，既是爱情的警钟尤其到测试爱情的强度的作用。
2
The Bell X-5 gave NACA and Air Force researchers a chance to test out variable-sweep wings.
在贝尔x - 5和空军赋予的NACA研究人员一个机会来测试可变后掠翼。
3
Bell and Watson had everything set for their first test of the invention.