Affix locking elements with viscous grease if necessary .
如有必要，请用粘性油脂粘住锁止元件。
The oil they produce is more viscous and acidic than the norm , and so harder to handle .
这些油田所产的石油比正常的更为粘稠更具酸性，而且更加难以进行加工。
The main reason raw vegetable oils do not normally work in diesel engines is that they are more viscous than standard diesel oil , and thus clog the engine 's fuel-delivery system .
For example , titanium dioxide ( a naturally occurring mineral often used as a pigment or thickener ) is considered to be safe when put into a viscous mixture , such as in sunscreen or toothpaste .
例如，二氧化钛（一种天然矿物，可用做着色剂或粘稠剂）在粘稠状混合物中是安全的，如防晒露或牙膏。
And at colder temperatures , oil is more viscous and diffuses less quickly .
