一小我的声音是没有气力的。
使两派完全合作是值得花一番气力的。
It's worth taking some trouble over getting the two sections perfectly aligned.
在胡安尼塔的记忆中，加减乘除对自己说来早就是如同呼吸一样不费气力的自然本能了。
Juanita could remember, adding, subtracting, multiplying, and dividing seemed as easy as breathing, and as natural.
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