从2008年起，植物学家利用电脑技术来编纂名录，这是必不可少的，因为单凭科学家双手不可能将130万植物名整理在案。
Since 2008, botanists have been using technology to help them compile the list. This was essential as scientists could not sort the 1.3million records by hand.
备份：对任何用到电脑，存储数据的人来说，备份是必不可少的。
Backups: Are essential for anybody who USES a computer and stores data.
在上一些课程的时候，用电脑教可能会更好，但是如果解释重要概念，老师仍然必不可少。
Some subjects may be better taught by using computers, but to explain important concepts a human teacher is still indispensable.
在现代的办公空间中，电脑是必不可少的工具。
In the modern office space, the computer is an indispensable tool.
如今越来越多的中国人热衷于学习电脑，因为他们清楚的知道在信息时代这是必不可少的。
Now, more and more Chinese people are eager to learn computers because they knew very well that in this age of information is essential.
上个世纪中叶电脑才开始进入我们的生活，今天电脑几乎已经成为我们生活中必不可少的一个工具。
Computer entered our lives during the middle of last century; today computer has become an indispensable tool in our lives.
YDH微电脑系列烘干机，具有温度控制全自动操作，烘干快速高效，改善工作环境，有蒸汽、电加热两种机型提供您选择。提高快速洗衣及提高服务档次必不可少的产品。
YDH microcomputer series of drying machine, with fully automatic temperature control, drying quickly and efficiently, improve the working environment, with steam, electric heating two kinds of models.
YDH微电脑系列烘干机，具有温度控制全自动操作，烘干快速高效，改善工作环境，有蒸汽、电加热两种机型提供您选择。提高快速洗衣及提高服务档次必不可少的产品。
YDH microcomputer series of drying machine, with fully automatic temperature control, drying quickly and efficiently, improve the working environment, with steam, electric heating two kinds of models.
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