can be

I have a fair idea of how difficult things can be.

我大致了解情况会有多困难。

The fluid can be drawn off with a syringe.

可用注射器将液体汲出。

Applying the dye can be messy, particularly on long hair.

涂抹染发剂可能会搞得一团糟，特别是长发。

They may feel tired and though outwardly calm, can be irritable.

他们或许会感到疲惫，虽然外表看似没事，但可能很容易发火。

Water can be purified by boiling for five minutes.

水煮沸5分钟便可得到净化。

Vaccination and other prophylactic measures can be carried out.

可以采取疫苗接种和其他预防措施。

Small pickling onions can be used instead of sliced ones.

小块腌洋葱可用来替代切片洋葱。

It can be beneficial to share your feelings with someone you trust.

向自己信任的人倾诉感情是很有益处的。

A cheap table can be transformed by an interesting cover.

一块趣味盎然的桌布就能使一张廉价桌子面目一新。

Operating systems can be brought to a halt by a Trojan Horse.

操作系统可能会因为木马病毒的攻击而中止。

In a dream you can be transported back in time.

在梦里你可以回到过去。

There can be little doubt that he will offend again.

毋庸置疑他还会再犯的。

Dry hair can be damaged by washing it too frequently.

干性头发洗得太频繁容易受损。

Stationery can be imprinted with your message or logo.

可以把你的信息或标志印在信纸上。

I'm as positive as I can be about it.

我对它有绝对的把握。