The advantage of biological control in contrast to other methods is that it provides a relatively low-cost, perpetual control system with a minimum of detrimental side-effects.

与其他方法相比，生物防治的优点是它提供了一种成本相对较低、有害副作用最小的永久性防治系统。

youdao

She's a perpetual student.

她是个终身学习者。

《牛津词典》

We lived for years in a perpetual state of fear.

多年来我们一直生活在恐惧中。

《牛津词典》

"We cannot wage a perpetual campaign where the only goal is to see who can get the most embarrassing headlines about the other side.

VOA: standard.2010.01.28

The Israelites certainly hoped to secure the perpetual aid and blessing and protection of a well-disposed deity.

以色列人当然也想从神灵那里,得到永恒的祝福和保护。

耶鲁公开课 - 旧约导论课程节选

Now, texts from Ancient Near Eastern cultures suggest that a central function of the rituals that were performed in sanctuaries was to secure the perpetual aid and blessing of a well-disposed deity.

古近东文化的课文中提出,在圣所里进行的仪式的一个主要功能,是保证能够向神灵获得永久地帮助和祝福。

耶鲁公开课 - 旧约导论课程节选

Audemars Piguet breaks this rule by combining its Caliber 2885 self-winding split-second chronograph movement featuring a minute repeater, a perpetual calendar and a moon-phase indicator with the sporty 44mm Royal Oak Offshore case in brushed titanium with a black rubber strap.

FORBES: Audemars Piguet's Royal Oak Offshore Gets Grand Complicated

But the total cost of a perpetual should be the same as a five year gilt, rolled over indefinitely.

FORBES: The UK's New 100 Year Bond

Thanks to the White Witch (Tilda Swinton), a perpetual winter has descended a curse that will vanish only with the arrival of Aslan, a messianic lion (voiced by Liam Neeson).

NEWYORKER: (director: Andrew Adamson; 2005)